Thoughts on choosing an amplifier

After much thinking, too much actually. I have narrowed my amplifier choices down to a Parasound a21+, a Benchmark AHB2, or two Schitt Aegirs. Presently, my modest system is a Pioneer PL 71 turntable with an Ortofon 2M Red cartridge into a Schitt Mani into a NAD C 326BEE feeding Quad 12L Classic monitors. Time for an upgrade, eh? I though I would start with an amp and some more speakers. 

The plan is to remove the jumper on the NAD integrated and use the NAD as a preamp until I choose a preamp to go with the amp. For what it is worth, I am leaning towards a tube preamp - maybe a 6NS7. I also plan to buy a few modestly priced speakers, such as Magneplan LRS,  Zu Omen Dirty Weekend, Bowers & Wilkins 603, GoldenEar Triton Five, KEF LS50, or Warfedale Linton, rather than one more expensive speaker. I like the idea of swapping out speakers for fun, type of music, etc. So I am looking for an amplifier that pairs well with many different types of speakers designs.  Which one of the three amplifiers would you choose?

From reading the forums, people often ask the poster what type of music they like to listen to. My music tastes run from Americana to jazz to opera to classic rock to ambient electronic; mostly Americana and jazz tho.

Thank you in advance for your collective advice. It is very much appreciated.
BigMusic - First time poster
I too seriously considered the Parasound a21+ to use with my recently acquired 0.7's Maggie's but being a frugal Canadian I came across a used Spectron MK III D class amp that has more than enough watts/current to drive my Maggie's and my DT Mythos ST's (91 db) for that matter. The tube pre amp I use is a ARC LS 15 and I really like the synergy between the two. If my used Spectron goes up in a puff of smoke, I will get the A21. So if you do decide on the LRS keep in mind they love power, the more the better. Happy hunting 

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Agree on choosing speakers first. Once I knew I had the sound I wanted I went through a few demos before picking the perfect match.

If I were to make a wild guess as to what would drive the majority of speakers well, I'd go for the Parasound. When I was looking, I had power up the wazoo, but not quality current. Once I got that, I found I didn't need that much absolute wattage. It just seems the speakers I gravitate towards are usually difficult loads.
I definitely recommend the A21+. I have the A21 and love it. I’m using a Parasound P5 preamp which is ok and I too am thinking about a Tube Preamp.

i agree you should choose your speakers first. The Parasound will drive pretty much anything you’d buy. I loved my Triton 5’s and they were my main speakers until I recently bought Klipsch Cornwall IV’s. I did however have to use two subs with the Tritons to get the extra oomph I wanted out of my system. They still sounded excellent without subs, that’s just a personal taste set up thing for me. The Tritons are very detailed and smooth sounding speakers. 
Best of luck to you!

I use Magnepan. 7's with the Parasound A21. I purchased the A300 Emotiva and it just could not drive the Maggie's. The Parasound has complete control, the sound stage is immense and the instrument separation is the best my 62 year old ears have ever experienced. 

My feeling is you can't go wrong with the A21+.