1) 1800XT and 1900XT are available in India. 1900XT will be around 29k or so, same with 7900GTX.
1800XT too will be around 22-23k or so.
Even if you do get Antec NeoHE430 in India which is not very easy, even a SP2 450 costs about 3600-3800, so that psu will still be 4-4.5k or so.
I would say...