Tight accurate midfield monitor pair suggestions

ATC SCM 20 - based on your description this is exactly what you need - used by Telarc and countless other studios. They have enough SPL to do midfield.

I can casually talk without having to raise my voice at all to talk to the clients while listening at 10-12 ft in front of the speakers.

At 12 feet back you lose 12 db. Asuuming you want at least 10 db of headroom then you are going to need a decent speaker, preferably with a pro woofer that does not badly compress when driven hard.

If you are judging rock at normal conversation level with your clients then this might be a bit too low a level for bass checks - you'll end up with overly bass heavy mixes unless you can adjust for it in your mind.

You want a speaker with a wide sweetspot and NOT a narrow dispersion monitor like a Dynaudio nearfield.

ATC will do the trick for you - will give a very large sweetspot for you and your clients. A larger Dynaudio or Merlin would work also but you said you don't want a floorstander - so I would not go that way....besides you have three near-fields already.

I'd also seriously consider adding a good tight subwoofer like JL F113 and have everything in room calibrated with a measurement microphone - see my virtual system for calibration plots.

PMC IB2S is another great option but it is way above your budget.

Have you considered Barefoot MM27? Double your budget but they are active so no need for a beefy amp...

I've not heard them but the design is rather odd (five tweeters) ...weird... a novelty perhaps?

They are the TIGHTEST and most ACCURATE pair of two-ways I've heard, By far. FYI, I've auditioned everything the pro-audio market has to offer ATC, Barefoot, Proac, Adam, K&H, PMC, JBL, Genelec, Meyer etc.... and none are as clean or natural sounding as the Rio.

You must be one of the first few owners of this new model - would you call this a giant killer? (kind of like the Benchmark DAC1)