just google for hardware sellers in india dude. u'll get results much quicker.
and regarding athlon 64 and p4, get p4 only if u can dish out around 30000 bucks and buy a p4ee. otherwise, amd 64 is better or equal tothan any other p4 processor.
3dmark

quake3
[img]http://img.photobucket.com/albums/v461/technomodel/opengl.jpg
[/img]
memory test-pcmark
video encoding
this is the only area athlon64 is behind p4.
and yes if u r interested in approx price diff