If you are near a Sam Ash store, they usually stock the 8020s in their pro studio rooms. I did my auditioning at the Times Square main store. I like the subs that matched with the 8050 back when, but decide against them as most of my music did not require a sub.
I use XLR inputs into my 8050. Either from my Roland keyboards or Grace M903.
I'm really leaning towards getting 8020b (BTW any difference between 8020b and 8020c, since I see a lot of updated models) and also a subwoofer (deciding between 5050a and 7050 and it's differences). Have you heard any of their subs. I'm hoping that the sub and speakers in a medium to small size room will be okay. Also, at night when I can't play the sub, the 8020 should work well).
I am thinking of feeding them through something like Emotiva Stealth DC-1 since it has XLRs. There were some people debating on getting an analog vs digital pre out depending on the model. For example, the newer ones with DSP accept both analog and/or digital based on the particular model. I'm looking at 8020 in particular, so hoping that the Emotiva would be a good fit.