When I first started working with audio, I hopped onto the bandwagon and purchased a pair of Rokit 6's. Of course this was a far superior sound from anything I'd heard before, but now that I've been doing this for a while, I learned quickly and grew out of the Rokits.
I was lucky enough to find a set of MK1 HR824's in my area, and have been loving them since day one. The low end is so perceivable, and clear. They're a bit warmer to me coming from the rokits, but my mixes were never the same. However, I am mixing in a treated room.
If you're in a small room, stray away from the HR824's as they are quite big, and really pack a lot of punch into them, but if you just so happen to find a set on craigslist or something, don't hesitate to check them out. They're older now, but they're famous for a reason.