Of course, the crossovers, active or passive, will cost you $50 to $150 throwing the DIY drivers over the budget. Wouldn't it be awesome if crossovers were free?
In this price range, I'd consider complete kits among these:
Morel Maximo (see the long discussion about these on the "hot deals" forum)
Alpine SPR-17S (old Type R, true and tested, sucks lots of power, good deal for the money IMO)
Alpine SPR-60C (new Type R, is completely new design, supposed to be better, but there are extremely few to no reviews)
Slightly over budget:
Massive Audio CK6V (sonicelectronix is taking pre-orders for $169)
Polk Audio MM6501