Thanks for the replies so far guys, I really appreciate it. I definitely understand the subjective nature of this choice, which is why my primary intent is to collect a list of combos that I may or may not have thought of -- along with some pros/cons for each.
I'm also not trying to rush this, I promise!
As I did with my entry-level Polks, I will attempt to audition as many of the combos as possible. There is vert little chance that I'll ever buy speakers without hearing them first.
I spent months doing research and testing before buying any of my equipment, but it was all centered around finding an entry-level solution. So, I'm almost starting from scratch when doubling the price.
After thinking about it some more, I have come up with a few requirements/restrictions:
1) must be black finish, but not glossy! (my sub is glossy, which I regret)
2) center speaker must be no larger than 8" tall and 27" wide to fit in my stand.
3) can't be, or sound like, Klipsch.
4) $1000 max, firm (but, if you think I can find them used for this amount, I might be ok with that too. I bought my amp on Audiogon
)
5) bi-amp preferred, but not required.
6) used for 70% HT and games, 30% music.
Unfortunately, WAF has vetoed visible room improvements; otherwise, I probably would have started there.
I'm happy with my bass response right now, so upgrading my sub is my second priority.
Like a poster above said, I just don't think my Polks are dynamic or clear enough for my (upgraded) tastes. They do a good job, especially after adding the UPA7, but just not "good enough" anymore.
Does all of this make sense?
Thanks again guys... Please keep the ideas coming!