busted, how are those plastic Barbie mics for drum overheads?
OK, smart-assery aside, sonusman, everyone's being vague or downright tangential because we don't know your application, your budget, etc. I can only tell you some familiar names in an entry/mid-range, then maybe you can trot on down to a store with your favorite mic and even pre, and sing through them, and also play a CD through 'em. This won't be ideal and you'll want to take the monitors home to test-drive them, but it's a start.
* Hafler M5
* Event 20/20s
* KRK Rok-It
* Hell, I dunno
I think everything I've listed is non-powered. Non-powered with a separate amp is a more flexible way to go; you can upgrade one or the other as deals/budget allows. Also easier resell for the same reason.
I have a pair of 20/20s which I got used for $200. I like 'em.