Yes, i had a similar conundrum so I planned it in phases, but it was because I already had older surround speakers and a relatively new surround receiver. My goal was to have a home theater that also had great 2 channel performance. No way was I going to embark on two separate systems!
Phase 0: use my surround receiver to power the fronts, surrounds, and center until I got a dedicated amp for the fronts such as the AVA.
Phase 1: pre-out the fronts to a dedicated stereo amp. I figured that would work fine since the surround speakers are less demanding.
Phase 2: fill out the other speakers over time. Salk of course!
Phase 3: is to upgrade the amp for the other 3 channels.
Phase 4: me slapping my forehead for forgetting something, but that's the nature of this hobby!