Good Morning,
Losing your outboard amps would be a step backwards (if they're in good shape). Use the 1050 as a preamp for your amps, and for the channels that you don't have amplification for. If you can afford it, bypass receivers altogether and get a high-quality pre/processor using outboard amps. The 950 comes to mind. There are many reasons for utilizing separates. I'm sure that you've heard most of them. If not, and you're curious, write asking more questions.
Mix
P.S. You didn't mention your speakers. Spend most of yur money there!