Let's build a PC here, I'm sure others could find alternatives to the parts I picked for better bang/buck... but I've had good experiences with these brands:
http://pcpartpicker.com/p/mBoo
CPU
Not knowing the exact part in the Alienware, we're going with the i5 because you were enamored with the i5 originally. Plus, we want to match or exceed the Alienware part-for-part as much as possible.
CPU Cooler
None needed, the retail CPU kit will come with a pretty respectable CPU cooler itself. If you want to go after-market but still get some good price/performance... the Cooler Master Hyper Plus has been my go-to cooler for my past 2-3 builds ($30 at
Newegg).
Motherboard
I've had good experiences with ASRock. Gigabyte and Asus are also good brands. I've not had much experience with some of the other manufacturers out there. You're getting one of the most recent chipsets here which should give you a measure of future-proofing. You don't get SLI or Crossfire with this board, but you said that you didn't game much, so no biggie. You can expand up to 32GB of memory if you ever chose to...
Memory
I like G.Skill, and at $37.99 you're getting to 2x4GB modules which leaves you room on that ASRock board to quickly expand to 16GB for only another $37.99.
Video Card
We're going to hammer that Alienware into the ground, so say hello to your XFX 7850 with 2GB of video RAM. XFX recently changed their warranty, but is still top-of-the-heap in terms of video card manufacturer warranties. Great company. An Nvidia 545? Hahahahahaha... oh, seriously?
Storage
YMMV with regards to hard drive brands... some swear by Hitachis, some swear by Samsungs. Western Digital is a known, respected brand and we're going with the Black edition to help keep your photos and videos safer... I have a 5 year old WD Black 500GB that is still kicking...
Which brings me to the SSD... you want something to keep kicking for a long time... how about a kick to the face?!?! The Samsung 830's are still top-of-the line until their new models come out... and we're not mucking about with a 64GB drive here... we're going to 128GB. Put your OS and programs on this drive, store your pics, vids and documents on that WD Black... best of both worlds, my friend.
You want to save some money? Fine, kick that SSD to the curve... you can live with that WD Black... but seriously... once you go SSD, you will never go back.
Case
It's a case. It holds your stuff. You want to keep your components nice and cool... if you wanted to go a little higher end, have a look at Corsair. They have done a great job in design ever since they entered the case market. Lian Li is also another well-respected name... some of their lower-end cases aren't as smooth as their higher-end cases, though. Cooler Master is another good name. Antec has been around the game for a long time, they know what they're doing.
Power Supply
650W is honestly, over-kill for your machine. But like I said before, we're going to hammer that Alienware into the ground... and I meant it. Gold has been tested the most, Silver second, and Bronze should meet and exceed your expectations. You could drop down to 400-550 watts and still comfortably supply power to your components, but at most you'll save maybe $20 under the one I included. Other good names in the PSU game: Antec, PC Power and Cooling, Seasonic, OCZ, and Silverstone.
If you can spend the extra to go modular, it's worth considering... tidier cables = better air-flow = cooler PC. But if you invest a little time in tidying your cables (zip ties are your friend here!), you can achieve a nice environment for your internals.
DVD
It plays stuff. If you want to step up to Blu-Ray, expect to spend about $50-60 or so to get into the entry-level Blu-Ray burners. A little less for just a player.
The Bottom Line
$813 after promos and rebates.
$730 without the SSD.
Budget another $100 or so for Windows... either way, you're looking at $913 to completely blow that Alienware out of the the water, or $830 to meet and/or exceed that Alienware part-for-part.
Either way, that Nvidia 545 is a deal-killer at that $899 price point... You're paying $899 for 1-2 year old technology, when for that same price or even less you'll be getting current-gen technology on each and every component in your machine.
SSD or no SSD, this computer will take whatever you throw at it and laugh in your face for a good long time.