Hi,
There are plenty of 5.1 speakers in that budget (40K), perhaps if you extend it by another 10-15K you can assemble your 5.1. There are two options my friend, either go for a 5.1 package or choose individual speakers (front bookshelves, center, rear and finally SUB). When you mention power full bass, do you mean boomy? How big is your room and would the speakers be used mostly for music or movies?
Regards
Rajiv