Primus 162
I have these speakers and they are easy to drive, they may be rated at 150 watts but they can be driven hard and loud with a lot less. The amp I have for the 162's is Emotiva UPA-2 @ 125 watts, this amp has all the power you will ever need for the 162's, right now it's available for $269.00 and free shipping. You will still need a preamp, I would take the suggestions of the others here and look for a decent receiver, amp and preamp on the same chassis. Hope this helps, there are quite a few receivers in your price range that would be more than adequate for these speakers.
Best regards, Jeff