Advice for speakers under $4K for mixed use

A used pair of Vandersteen Quatros would be a superb choice
we have installed many of these phase and time correct design also featuring room compensation.
The Quatros perform with full range performance with genuine bass to 25 hz and maintain their balanced dimensionality even in corners inches from the side and front walls with amazing results.
Cheers Johnnyr

IME, Thiels need huge power to show what they are capable of. I doubt that the AVR you have has enough juice for Thiels.

I think the Josephs are an excellent alternative.

The Quattros would work well, since they have powered subs in each speaker. Finding a nice pair used for $4K is not impossible, but may require some patience. Also, you will forfiet the dealer install & setup you get when you buy new, so be prepared to spend some time dialing in the bass.

I have a combo 2-channel/HT system myself. Please check my System link. I am really enjoying my Ohm Walsh 2000s ($2800/pr) for both music and film. Note that before I was able to order the center (and after I had sold my old center), I used the Ohms in Phantom Center mode. This worked quite well, although I am glad I have added the matching center channel speaker. The Ohms also like a lot of power, but if your room isn't too large, your AVR should work. My 2000s are 9" square with a slightly larger plinth.

Marantz is 8x140. Will that be enough power?

Enough for what? For efficient speakers in a moderate-sized room? Sure. For a huge room and innefficient speakers, probably not. Keep in mind that most AVRs typically cannot deliver their rated power, full bandwidth, with all channels driven. The more channels you drive, the more the power output per channel drops. A powered subwoofer(s) will reduce the power demands on your AVR if the speakers are high-pass filtered.

I can second that the Thiel CS2.4's are a very fine speaker and require a good strong amp of high quality to really sing. Only after I spent more on amplification than paid on the speakers "new" have I heard it to it's full potential. Try and listen if at all possible and good luck! PS. The factory just sent out an email saying it's raising the price like 1k more pretty soon