AVS Special Member
Join Date: Dec 2002
Location: Twin Cities, MN
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The 570 will definitely match the 60s well enough. Basically, IMO 60+570 is better than 60+470, but ideally the 100s match with the 570. I was going to upgrade from 370 (completely temporary) to 570, then 60s to 100s, but I'm just going to do them both at the same time, next month (a few days before Christmas).
Currently I'm forming my opinions from auditioning and many others' comments on the forum. In a month I'll be able to compare more in depth having experienced them both in my listening environment. Note that the 100s really need an amp to bring them to their full potential, moreso than the 60s, due to their increased bass response.
..Which comes to your other question. 100s seem to basically add low end for the most part, but also take some load off the mid-range and tweeters with the additional drivers they provide. So basically, slight improvement in mid & high, and a more significant improvement in the low end (after all, they have two more 7"ers and larger cabinet space).
As far as crossover settings, that very much depends on the combination of speakers, amplification, and most importantly, your room. I'd set it at 80Hz as you said, and play with it from there. If you have decent amplification (150W+) on 100s, I'd lower it a bit to take advantage of that.. If you have a typical receiver powering 100s, or 60s, 80Hz would probably be the lowest I'd go in general. My 60s and SVS PB-12 are crossed over at 80Hz at the moment.
Oh, and as for the rear speakers, that seems to be personal preference. I tend to go for the diffuse effect and like the 470s. That's what I'll end up getting, but not until I build my dedicated home theater. I currently use directs because that's what I have, and they're 15' behind me. I've thought about getting 20s or 40s and trying them in my (future) room, and if I like the 470s, keep them, and put the 20s/40s in another room, such as the living room.