Having owned MA Radius, MA Golds & MA Apex, I found the Apex, although fine, needed a little more energy to bring them to life compared to the Radius - they're just a little more relaxed. Personally I find the Pioneer / Apex combo excellent, but I would encourage you to demo the latest receivers. I found the tonal match, particularly with piano, spot on.
The Pioneers are a little forward. Also consider the Anthem MRX520 (also forward & punchy sound) or the latest crop of Denon, Marantz & Yamaha if you like something a little warmer.
The very latest SC-LX701 / 801 / 901 receivers aren't in the shops yet in the UK (or indeed on Pioneer.EU's own website!!) but they offer an excellent set of streaming options now and are bang up to date spec-wise. They would be on my shortlist.