check out
Velocity Micro Computers. They are more expensive than dell, but less so then alienware, falcon northwest, voodoo, overdrive pc, hypersonic, screamworx, and the such. They get pretty good
Reseller Ratings. Also check out their system reviews done by
CNet, and others done by PCMag(
Velocity Micro Vision 64,
Velocity Micro DX-W). The ones they tested are more expensive then your price range but I was just posting them to give the Velocity Micro credit as being a good dealer. Mess around with configurations on their site. Go under the Home & Office computer tab on their site to begin.
I must admit I am in the market for a new pc as well and will be purchasing somewhere in april-june. Velocity Micro is the front runner in my picks as of now but Dell is up there for price reasons. I don't have any experience with either as I am on a 4 year old iMac right now(A WONDERFUL computer as I have had ZERO problems). I am getting a pc though for gaming, and college purposes and that I must learn to be very comfortable with them as they are the more commonly used in the business world. The main reason I have Velocity Micro above Dell is that they use all retail parts and you can get no propriety parts. This means you can get a name brand good PSU like Antec TRUEpower series, a known motherboard, and the such. You will be able to find information on each component online so that you know everything will work together before buying. The name brand parts will also run the computer smoother and it is nice to know what company made what part and what it is EXACTLY.
AMD will probably cut prices some time this month on there processors(Feb 15?) so wait untill then at LEAST. AMD will also be moving from socket 754 to socket 939 which will create a new upgrade path. I can't give you all the technical jargon as to what this means in full but I do no that the socket 754, although it will continue to be supported for sometime, is nearing its end of potential upgrades (Ending with the AMD64 3700+ I think). That means socket 939 will be much easier to find better upgrade options when you decide to upgrade, in your case years down the road hopefully. This socket change is rumoured to happen around March 29 or a little there after. Intel also has some good cpu's with Hyperthreading which is nice when running many DEMANDING programs at once. Personally as of now I plan to go with a AMD64 bit processor as I see them to be a little more future proof with 64 bit computing being discussed more and more each day. Don't expect a 64bit windows for over a year though as the recently released beta expires in 360 days so this is where I get this estimate.
For a video card as of now I think ATI Radeons have the edge in performance but their drivers are sometimes not as forgiving as those of NVIDIA. The power needed to run Half Life 2 and Doom 3 is not yet known so it is hard to make a estimate of what would be good. Right now I think the Radeon 9800pro 128mb video card would be a good card for those games but others may have better insight.
For the monitor I would recommend buying it separate from the system at newegg or monitorsdirect.com as it should be cheaper then combining it with a system from a vendor except for maybe the exception of Dell. NEC/Mitsubishi, Viewsonic, Hitachi, and Samsung all have good CRT monitors. I don't know if you were planning to go with LCD or CRT but for gaming a CRT would be preferred as it can deliver a faster response time. A good 19" would make you very happy, check out the
NEC/Mitsubishi Diamondpro 930sb for the best quality although be it more expensive, the
NEC/Mitsubishi FE990 is a less expensive toned down version of the 930. The
Hitachi CM721FB is also a great monitor. For a less expenisve monitor that many use and love the
Samsung 955DF does not disappoint much.
Overall I recommend you wait awhile but don't get too drawn in to release dates. Technology is constantly changing and evolving to better things. If you do not buy at some point you will wait forever for the "Next Best Thing". I am interested to hear what you decide to go with though as I will be purchasing eventually as well. Please keep in touch in this thread!