Or do what we all do and just keep buy till u find one u like then buy some more anyway.Cqb for me is just my pistol with a torch under it.
Normal play/urban involves a rifle with a torch to one side, a peq laser on the other, a grip on the bottom and a tracer unit. Oh, and an acog......i love a good attachment or five! Haha the acog is mainly because it looks cool, and the peq with laser is to hold my batter as it wont fit in the handguard anymore.
It may be a case of trial and error, maybe ask to borrow something for a game and see how it works for you?