"I don't have anything guys, I'm a total noob and am *just* starting out. I figure 4K is around good price for a 'pro-sumer' cam that I could do pseudo-pro work with."
XJR-O....What is your total budget?
As a "total noob", you should definitely listen to what Lethal and others have mentioned about learning before leaping.
Your body (camera) is about 20-30% of the total video package. Sound is paramount to good video. It is mandatory and can ruin your picture quicker than crappy video. Support is fundamental. Just like you need a foundation on your home, you'll need sticks/head or a body support system (Zacuto/Redrock, etc) to take decent shots. High Definition is about as unforgiving as it gets when it comes to focus and a stable shooting platform. External monitors can be necessary....microphone/XLR cable/field mixer OR a secondary sound system (Zoom h4n, Tascam, etc)...
Then you gotta budget for media....If you stick with the HMC-150/z5u and other "prosumer" cams, this isn't as bit an issue (SDHC cards)....but, if you step up to the next level; EX-1/3, HVX200a/HPX170...you'll have to budget for SxS or P2 cards....(up to 10x the price per gig compared to standard memory formats; CF/SD/Memory Stick, etc).
Then your work flow....the latest AVC/XD-Cam/Pro Rez/DVC-Pro HD, etc, etc. Can be VERY taxing on your computer system...are you up to date with your hardware? How about storage? You can burn through Terrabyte drives after a good weekend of shooting these days!!! Software? Which direction? Mac/PC? Final Cut Pro is a cool thousand bucks! FC xpress has limitations, especially with the level of camera you're looking at.
I totally spaced lighting! How could I be so short sighted!!!! ALL, I repeat...ALL of today's video capture devices...whether it's your iPhone 3gs, your FLIP HD, Panasonic HVX 200a, or the latest Arri/Panavision/Sony/Red/Fill in the blank High Def cams.....the biggest handicap is LIGHT! Gotta Have it. Some have better low light performance (less video noise) than others, generally as you go up in price....However, there is a new crop of V-DSLRs on the market that give you incredible low light performance (but they have a load of OTHER short comings and at this point make a better complimentary device than A cam, IMO)....while the price of admission is getting lower (under 2k for the Canon 7d kit)....there are a ton of "peripherals" necesary for shooting comfortable with the new DSLRs...media, lenses, tripod or stablization rig...etc. adds up quick.
Then...as you already know and have been humble enough to admit...you are a noobie, so you've got to learn how to put the whole thing together. Make your lighting, cameras, mics and sound gear, XLR cords, Gaf tape, reflectors, assistants, etc....work together as a system.
It doesn't happen overnight....there's a lot to learn and jumping into a $4k kit is NOT going to make it any easier to learn than picking up a 12-1500 used camera rig (DVX100 comes to mind, great SD/16x9 camera)....and learn the craft. See if you have the patience....that's 95% of it. You gotta shoot, shoot, and shoot....then edit in post and see what you do and don't like...then go shoot and shoot some more. There is no substitute for burning through film (SD cards) and experience behind your camera.
I've been shooting with Panasonic for the last 5 years or so...so it's an easy recommendation for me....DVX100 OR, look for a low hour HVX200. They're everywhere (ebay, Craigslist). The operation hours are logged in the menu system....and lots of folks bought them and didn't use them

The 200a is a newer model with same sensor block (and hense, lower light sensitivity about a stop lower), and a newer, maybe bit wider lens (same guts as HPX170, which is tapeless and has extra goodies...SDI out, scope, and a couple of ergonomic improvements). The 200 and 200a keep the mini DV deck (for SD recording only...P2 or Firewire to computer/drive for HD) I also shoot with the EX-1 and love it....but it, the 170, and 200a are a bit out your price range.
If I haven't talked you out of it yet, I would look around for a used HVX200, couple of 16g "E" series cards....maybe a 32gig as well....and instead of a 35mm adaptor, pick up the Canon 7d with a 17-55. This will give you the best of both worlds....Low light/shallow DOF shots....and an excellent camcorder with many different framerates, pro audio capture, and the ability to make some excellent pictures!
Good Luck....it is a never ending process, if you decide to jump in head first. It's a blast though...I'd rather make my living and pay my mortgage in NO OTHER WAY! I've been shooting stills and video for almost 2 decades and I learn something at every gig I do

Find a local mentor...if you can get on at a local news station, volunteer with local film festivals, attend a class or two. Pick up a couple books, scour the internet. It's not brain surgery...but it's not nearly as easy as it looks
PS...Forgot to mention....stay away from the HDV cams (Canon). It's a dead format. We've seen the end of it and the future is solid state. I love Canon. Shoot solely Canon for stills, but I've steered away from their pro cam offerings (The HG/HF/Vixia 10,20,30,40 or great consumer cams), including the XHa1
J