OK I am in the field. I just finish building a few high end gaming machines.
This is what I personally recomend you getting.
First look at the motherboard. I recomend the latest fastest mother. This motherboard is the latest 680I chipset from nvida that will not only deliever power and performance but it will last you many upgrades in the next 3-4 years.
This is the model number of the motherboard
EVGA 122-CK-NF68-A1 LGA 775
http://www.newegg.com/product/product.a ... 6813188013
Now for the processor
I recomend you purchasing a quad core processor from intel. The Quad is like 4 processors into one.
At the present time there is a few ont he market and it can be pricey. I recomend you by the 3rd tot he top sicne ht prices do go down and at a later time say a year youc an get the top one for less money.
Quad Q6600
http://www.newegg.com/Product/Product.a ... 6819115017
As for the ram. I woudl stay away of buying 512 megs of ram chips. I would be buying two 1 gig sticks. They are not that expensive. The motherboard can hold 4 gigs of ram atleast the one I am recomendeding. I would use a brand name like corsair or crucial.
http://www.newegg.com/Product/Product.a ... 6820145043
Hard drive
I would get the SATA 3 hard drive. They are really fast.
I recomend seagate Baracuda 250 gig 7200 RPM Sata 3 (this transfers at 3 gigs a second)
http://www.newegg.com/Product/Product.a ... 6822148155
Now for the power supply. This is very important. Are you wanting to use DUAL sli video cards? I suggest you do since this rig is really designed for it. if you choose to go that rout of using two SLI nvidia cards U can use the latest one which is the 8800GTX dual or you can use the 8800 GT dual, or if thats still a littel over your price range then go in the 7000 series of nvidia. I do currently owna nd use two 8800 GTS and I have to say its a huge difference versus the 7000 models. The imaging is phenomenal.
Ok the power supply should be in 1000W if you using these high end Video cards if your usign a low end then you can get away with 750-800 wats.
Case I recomend the following case. It has plenty of fans and the breathign room can handle the hotest areas.
http://www.newegg.com/Product/Product.a ... 6811129021
As for floppy drive, dvd drive and burner u can just use that what you have form your old pc to this new pc. But incase you want a good burner let me know and I recomend ya one. hope the info I gave you helps.