Amp Options
FYI,
The 705 does have the pre-amp outs. The 605, however, does not.
For a budget stereo amp to experiment with, consider a Behringer A500 for <$200 shipped to power your mains. I have the entry level Emotiva LPA-1 and also recommend their products. The amp is driving my 4 ohm Onix Ref speakers and a couple channels power a distributed audio system.
They should have the 7 channel LPA-2 and the 5x200 Watt XPA amp out in February. Looks like the XPA will be $799.