I have the 990/7500 outlaw setup. As for the amps, the 7500 has all the power I need in a 5.1 setup in a 2300cu/ft room. Trust me I like things loud and clean. The 7700 will have all the power you need. As for the 990, it is a little behind the times for the hdmi outputs. As an owner, the outlaws have taken their time on developing and testing the products with great support for the customers(as with the axiom family). Im sure the new pre/pro 990? will have the new features that people are looking for. I for one am waiting on the new 990.
