Some of those aren't playing anymore, but if you have any questions about the shows I'd be happy to answer them. Also
www.Vegas.com has good info on each show and sometimes a clip of the show you can play.
As far as what show I'd recommend.....hmmmm. Obviously all the Cirque shows are great. KA was spectacular!! It really was amazing. I'd recommend that to anyone. The stage itself was amazing the way it moved and became almost like another character in the show.
Love was a lot of fun. Not quite as impressive as KA but still very, very good. And before going to the show I was not a fan of the Beatles. I knew maybe one song of theirs. But I still really enjoyed it, so for someone who is a Beatles fan it would be even better.
I wasn't as impressed with Mystere. I don't know why. Maybe after seeing KA and Love it just wasn't as good.
And Zumanity was really good. That would be nice if it was just you and your DH going out, because it's very adult themed and has nudity.
I know the prices are high. Confession time: We didn't win the lotto or anything to go see these shows. LOL
We've been lucky that we were able to see so many shows with a locals discount. Our KA tickets were only 50 bucks each for the 6th row from the front. Same with Love. Fifty bucks each.
Mystere, Zumanity, Mamma Mia, were all half off for locals. They just run these specials for locals during the off times to fill up the theaters.

We just lucked out because if we had to pay full price, we'd never have gone.
Not that they aren't worth it, we just can't afford it.
So I can understand how you are having a hard time with the prices. I would too. What I'd suggest is to look for discounts. There are ticket brokers on the Strip that offer half price tickets for that night. It always varies as to what's being offered but in the past I have seen shows like KA up there.
Also if I hear of any discounts, I'll let you know. But you really can't go wrong with any of the Cirque shows. They are amazing. Especially KA and Love. (never saw O, but I also heard great things about that)