The 4802 has a very good pre-amp with a great decoding section. It also has the advantage for 2-channel stereo to use the "pure direct" mode.
I'd look at the Theta Dreadnaught and the Balanced Audio Technologies VK-6200. Either the Theta or the BAT can be purchased in 3 channels and later up graded to 5 (or in the case of the BAT 6) channels when you get a new surround processor.
Of the two, my choice would be the BAT VK-6200 (if you have the budget) for pure sound quality. However, if you have the chance you should audition both (preferably with your surround system).
Each channel in the BAT is a separate amp with its own power supply - all housed in a single chassis. It has both single ended and balanced inputs. The VK-6200 is a monster. A 6-channel configuration weighs well over 200 pounds. It's also really, really looong. If you think you might have a depth problem where it will be installed, you would do yourself a favor to look at the BAT website to see how big it is.
Use the new 3-channel power amp to drive the front speakers and use the 4802 to drive the rear surrounds. When you buy a new processor, add the additional 2-channels to the power amp for the surround speakers at the same time. Or, if the case is that you have the money currently, buy the amp with all 5-channels and use the 4802 only for a pre-amp.
