Looks like a good budget build to me. You can add more RAM, add another 3870 for CF, and upgrade to a quad core latter on so you've got room to grow. I say for your next upgrade you should get a good CPU cooler to overclock your CPU and add another 3870 before they disappear. Well, maybe by then you'll just upgrade do a DX11 GPU instead .
Anyway, looks good. You should be fine with 2GB for now.
------------------------------Playing X-Men Origins: Wolverine Athlon 64 X2 5000+ @3.24 Brisbane | GIGABYTE GA-MA790X-DS4 | 4GB Mushkin DDR2 1066 | Plextor 760A| 2x 3850 512M CF| WD 1TB Black| Fortron Blue Storm II 500W | APEVIA X-Dreamer Black | Win XP Pro & Vista Buisness 32bit
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