Okay, here goes. Just a few tips for picking out parts.
1. Newegg good. Newegg VERY, VERY good.
Newegg is THE best place to get anything, period. However, it's not the cheapest.
2. ASUS good. Gigabyte often not so good. Chaintech good. Soyo often not so good. ABIT almost always good.
Just some reccomendations to motherboards. Mind you, there are exceptions, so check the reviews at the 'egg. (Don't buy anything with less than 4 stars.)
3. Get LOTS of ram. At least 1 gigabyte.
4. Invest in a good heatsink, fan setup, and case.
A crappy case just is'nt worth the headaches. Mind you, it need'nt be expensive; just snag someone's old Antec Sonata or the like for 40$ or so on the F/S/T forum.
An outlay of parts, and budget for a decent PC:
Sempron 3100+ CPU. 77$.
http://www.newegg.com/Product/Product.asp?Item=N82E16819104220
"Open box" GEforce 6100 motherboard w/ PCI express. 37$.
http://www.newegg.com/Product/Product.asp?Item=N82E16813138266R
Sunbeam PSU. (I might go for something a bit better, but this one is rated pretty darn well.) 480 watts. 20$
http://www.newegg.com/Product/Product.asp?Item=N82E16817709010
NEC 16x DVD burner. 40$.
http://www.newegg.com/Product/Product.asp?Item=N82E16827152056
Powercolor X800GTO graphics card w/ 256mb RAM. 110$. Good performer!
http://secure.newegg.com/NewVersion/Sho...ppingItem.asp?ItemList=N82E16814131007
Total cost from NewEgg: 410$ + shipping.
This machine should do moderate gaming just fine, in addition to whatever else you throw at it.
A well-rated case to put this stuff in:
Cooler Master Centurion, 45$+nasty shipping.
http://www.newegg.com/Product/Product.asp?Item=N82E16811119088
Gigaram 2x512mb kit, PC3200 (400mhz), CAS2.5. 77$.
http://www.newegg.com/Product/Product.asp?Item=N82E16820221027
Hitachi Deskstar 80GB SATA-II 7200rpm/8mb HDD. 50$
http://www.newegg.com/Product/Product.asp?Item=N82E16822145082