Yes, it is quad core. I know quadro is nvidia's GPU.
4 modules might not do well with AMD, but doesn't Intel do better with 4 modules? Anyway, getting a single 2GB modules may set back 15-20k, rather get 2 X 1GB RAM now and upgrade 2-4 months down the line when RAM prices become fine once again.
Raptor is very very expensive, and it may be fast, but it isn't fast enough for the price, so there is no point buying it unless he has enough money to spend atleast 1lac per year on his computer. Then also he has to think whether to invest in it or not. Besides Seagate 7200.10 drives are very fast.
Directx 10 cards will consume a lot of power. But getting anything over Antec NeoHE 500 is a waste. That PSU costs around 6k, Antec NeoHE 550 costs around 8k. He won't be using more than NeoHE 500 right now. The best PSU available in India is Antec Trio 650 which may or may not be available and will cost 9k+. That too may just about be able to take Dx 10 card but probably won't be recommended. So he basically wasted his 3k for nothing. Rather, buy NeoHe 500 now, sell it later or buy a separate PSU for the GPU, such PSUs have already reached newegg. That way you save the most and gain almost wholly.