These monsters are on sale over at UBID for $600 a pair. I have never heard them, but from the specs, they are VERY efficient, 97 Db. You could probably drive them with just about any midrange receiver. They are 8 ohm, which also makes them easy to drive. If you were going to use them without a sub, you may want to go a bit higher on power, to drive those huge 15's.
You need to include a budget for any useful feedback on what to power them with. For super cheap, I would look at the sherwood receivers. They seem to be a good bargain.
Where the heck are you going to put these things? Just curious. I picture them in a frat house getting beer spilled on them
Pat