Anthemus is right, check out the 150, it's an excellent choice for you.
Also, the original HVX200, not the A model, is going for a song these days. I've seen used models with a 16g P2 card on ebay and a load of extras for less than 3k! Here's one now
http://cgi.ebay.com/Panasonic-HVX20...ultDomain_0?hash=item2ea9973f94#ht_862wt_1167
Impossible to lie about the number of hours as it's in the menu system. Just find an owner you trust and sell your DVX to finance. Should be able to get a good chunk as it's still an excellent camera!
The HMC-150 though is a newer sensor block, about a stop better in low light (similar to 200a and HPX170), shoots to SD not P2, and has all of the manual control you're used to now. It does shoot a different codec, and not as friendly to post (AVC), but...there are work-arounds. Definitely a good choice.
I'd stay away from DSLRs for now...as you are limited to time (12 minutes) at a shot and you're shooting events. Other than that, JVC has a new 1/4" camera that may be worth exploring.
As to your questions about the handheld consumer cameras...as a professional (being paid to do the event), IMO, yes...you will catch some flack. Not only because of the physical look of using the camera at the event...but also the look of the footage you're able to achieve. As mentioned earlier, weddings are notoriously bad for lighting...you're going to have to light up the altar, aisle and reception hall like a Christmas tree if you're going to have any luck with these 1/6" sensors...you'll have very deep DOF shots always, and the lack of any kind of manual audio control will necessitate second system recording (Zoom, Tascam, etc.)....it's also, IMO, a pain to keep those little guys steady while shooting handheld!
You'll do much better for yourself keeping the DVX and waiting til you can jump into a 1/3" or bigger sensor for HD shooting. I also shoot weddings, generally 3 camera shoots (HVX200a, EX-1 and either 5d2 or 7d for specialty shots pre and post celebration...not for run and gun) and I dread shooting indoors with my HVX. I had to buy the EX-1 at the time...as it's the most I could afford to get better low light footage. It's just a pain to try to convince the bride you have to take away from here beautiful candle lit service...with a bank of 3,000 watts of lights
I suppose another option would be to keep your DVX and grab a Canon 7d for some "extra" footage and the option to shoot HD for some things. This would be an under 2k investment and you'd still have both options...just thinking out loud

I do dig the abilities of the DSLRs in low light...they've come in handy on a couple of different dark shoots this year!
J