I have fond memories of the Paradigm Mini-Monitors as being one of the earlier speakers I listened to and liked the sound of, but they are really not special in any general sense, certainly not in the same league as the DCM's!
I would cross them off the list.
I would also cross the Infinity Primus off the list. I see $175 as a reasonable (but not "buy it and make a profit!) price for them. They were the standard bearer for a budget tower before the Andrew Jones Pioneers were on the scene. Also, I'm not really keen on buying a 5 speaker set for my hobby unless it is such a deal that I know I can flip it or I have a pre-determined destination. It is harder to sell a 5.0 setup and I usually don't bother with setting up anything but the mains for my "hobby experience" in 2.0 or 2.2 stereo anyway. Lastly, given that the Betas are a step up and 3/$100, they would nudge out the Primus for me! Not saying the Betas are worth getting, just saying I would get them before the Primus.