[ranjan2001]

The best advice would be build up ur system step by step

Go for 1GB as of now, upgrade later to 2 Gb later this will take u to dual channel mode as of now u run 1gb in single channel mode.

1.5 will have trouble in dual channel, for dual channel the ram should be a paired ram of same config.

either go for 667 which can OC to 2.4 orgo for 800 which can Oc to 3.4 but remember u need a gud cooler before u think OC to that speed, dont know which part of India u live but here in delhi I cant run OC now as the temp goes too high.

Problem in ur approach is that u want every thing best in ur budget.................better would be plan & build system in parts so within 6-8 months u can have what u want rather than trying everything for just now in ur budget.