Romcenter

Hi,
I am looking for refined versions of snes and genesis dats, I have full rom sets for both these consoles and I am happy with having roms from different countries but for each country each game has about 5 or more different roms(with [b1] [b2] etc). I have no need for all these different versions I just want one version of a game that works correctly. Can anyone tell me where I can find dats like this or do you know of an easy method of separating the roms in this way?

Thanks
Guts

For what it's worth, I've got a Best of GoodSNES dat. Not sure where I found it though.
here