@ghdprentice has a point, but it all depends on what level you’re goal is and how well you like your current speakers.
When I purchased my Focal 836v speakers I was able to audition them on the Krell setup that was there for the Grande Utopia speakers. Upgrading my receiver was in the longer range plans, but when I hooked them up to my Onkyo receiver the sound was simply anemic and hollow. It didn’t take long before I picked up an Integra 50.1 receiver that was sufficient to allow the speakers to sound good.
I still have the Integra receiver, but have added a Pathos integrated for stereo and use a custom switch for them to share the speakers.
If I were looking for a receiver I would be looking for one with pre-outs for the main channels so that a power amplifier or stereo integrated with a home theater bypass could be added in the future. I also would want it to be 4 ohm stable. Receivers don’t all sound the same, but the user interface is also an important factor based on individual preference.