I've been out of the DIY loop for quite some time, as most of the time I've gotten systems from my company to do work on. I have an Athlon XP 2800 based system that I put together back in 2001, so I would like to move into this decade as far as tech is concerned. I want to get something I can add to (new GFX card, better disks, etc), but I don't want to break the bank right now. The main use for this system would be something to do my software development work on when I'm in the home office, basic office-y type stuff, and then eventually something I can upgrade to play FPS on after I'm done working. I do want to be able to overclock this system as well, but I am fine with not doing that until I get a better heatsink/fan for the processor.
The problem is only the PSU, gkay09 is correct about the PSU. Get a better one.
You might need about 750W for the SLI or X-fire and the OC, especially for 2xHD5870 (this needs 4x PCIe 6 pole power cables). Corsair and Antec are good options.
The mobo and proc bundle from gkay09 have no significant changes to the system compared to what you have listed. Get the cheaper combination.
^ Well the mobo and the proc bundle significantly reduced the cost, which the OP is looking for...
And as for the graphics, groggluebutt which one do you have or planning for ? like guanyu said, based on the graphics card, select the PSU - but a quality one though...
I just wanted to follow up to say I got all my parts from NewEgg.com, and installed them this past Friday. These components are an _awesome_ value. My performance is 3X what it used to be for all tasks, and that is without overclocking anything yet. I can play Half Life 2 on slightly better settings than I was playing it before the upgrade on _just_ the built in Radeon chip on the motherboard.
I'm really happy with this build, and I think I have a lot of room to OC and add this this base for a number of years. Thanks for the suggestions!!
Good that you enjoy your system. If you have some money in the near future, you might want also to get one of the SSDs. This will boost the performance of your system significantly, but you don't have to get it now if you can't afford it because you have just spent for a new rig, you can do it anytime later.