For this type of Games you listed, you can buy a pc for not too much money.
I would suggest something like that:

• AMD Athlon XP 2500+ or P4 2.533 GHZ for the Processor ~ 100$
  A fitting Asus Mainboard ~ 60$
  512 MB Ram (DDR400) ~ 80$
  Radeon 9600 Pro ~ 110$
  80 GB Harddisk ~ 65$
  
  LG Electronics L1710S 17" LCD Monitor ~ 330$

So, since I'm swiss I don't know any good Comp-Shop in the US, so I'd suggest you looking around for a PC with
similar specs to what I've listed. It shouldn't be too expensive and run the games you named just perfectly. (good price/effort)

maybe I forgot something, but it should be all.. I hope I could have helped you with this.. :mellow:

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