The impedance listed for those speakers is 8.5 ohms, so you should not have a problem running them with just about any receiver out these days. They have a sensitivity of 90dB, which means that they'll play pretty loud without a huge amount of power.
There are many good options out there for receivers in the $500 or less range, and which one to get depends on which features you want. Some things to consider are, do you want (a) audio processing over HDMI or (b) pre-amp outputs so that you can add an external amp later on. If you want audio processing over HDMI, then you're looking at things in the $300 and up range. If you want pre-amp outputs, that might be a bit more (but I haven't done extensive looking at this year's receivers).
Some suggestions for receivers to look at are the Yamaha RX-V663 and Pioneer VSX-1018. There are new models of those out (or coming out soon). Denon, Onkyo, and Marantz also make nice receivers.