I have a pair of the Alesis Mk2's ... they're not fantastic monitors by any means (a little muddy, too much bass, no shaping controls), but they're not bad for the price ($340US, got them from GC for $300), probably the best i've heard with 6.5"+ woofers in the price range ...
However, I have yet to hear the Wharfie 8.2A's that everyone's been raving about, so if you can, take a listen to those before buying anything... but if not, I think you could do a lot worse than the Alesis.