I'll second Mattkimb96's response. It depends on your music/HT listening is split and your bank account. I lean much more to music than HT, say a 90/10 split. I own Vienna Acoustics Strauss speakers with Haydn rears. I'm currently running with a phantom center, and prefer that to when I owned a VA Maestro center channel. I think the Strauss image so well that the center channel was unnecessary in my case. I've downgraded through the pre/pro's over the years, choosing to invest more $$$ into stereo, and less into HT. So I'm currently using a Denon receiver for my HT needs, with a Mirage BPS-400 subwoofer. The Denon receiver only provides the power to the rear speakers. I use the FR & FL preamp outputs from the Denon into an input on my BAT VK-51SE preamp, thus using my BAT VK-600SE to power the Strauss speakers as my FR & FL. Set the Denon receiver for 'no center' and the center info is passed through the FR & FL.
This does HT plenty well for me, and I don't miss all the fancy pre/pro's and multi-channel amps. Music however sounds MUCH better. That being said, if HT means more to you than to me, say more like a 50/50 split, you may want to spend more on the HT end.
My recommendation in order of importance, pre/pro and amp or reciever first, subwoofer second, rear speakers third, and center channel last.
As for matching center, I would go with at least a Maestro, should you decide you 'need' one, and if you're feeling extra wealthy, spring for the Oratorio.
Good luck, and have fun.