get a good UPS. One from APC will do. How much u need is upto u. I have a APC 500 which gives me abt 15 mins back up. The main aim is for me to be switch off my system normally. The rest seems fine. I am assuming since you did not mention a monitor that u already have one ? Also go for a higher capacity HDD. You will find it useful. As for RAM go for Corsair. Better performing RAMs. If it is not available then Kingston. Hynix generic RAMs are also good.
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AMD 64 3500+ Venice
DFI Lan Party Ultra-D
2* 512 MB PdP Memory with 2-2-5L timings
XFX 7900GT 256 MB Card
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