Thiel 7.2 or Revel Studios

I believe the Studios are slightly better. IMHO.
(Since I own them, they must be the best, right?!)
However, the Theils are also quality speakers.
I doubt you would go wrong with either one.
I don't think it takes hundreds of hours to break in the Revels though. Maybe a hundred hours or so. They sound pretty good straight out of the box, but I will agree that they do sound better the more they break in.
The Revels should sound good with your Krell amp. I use a Mark Levinson myself.

Good Luck in your search.

I personally prefer the Wilson Sophias in the same price range, or the Dyn C4s a bit above, which you should audition as well. It's all about taste at this price point.

I want to thank everyone who took time out of their busy lives to give me some good imput concerning the Thiels or Revels. Considering that my listening room is 25'x 22' the Thiels would do a better job with a room that size. However I do not like a bright sounding speaker and I would be willing to change out my Krell. I talked to the tech people at Thiel and Krell was their amp of choice to power the 7.2. The Revels from my understading do not tend to be bright. Jdevine how does the Mac 602 sound with the Thiels.

The mc 602 made a big improvement I was using a Mc 500 with the 6's and for a short while with the 7.2's but the 602 was a big improvement nice tight bass and plenty of it my room is smaller than yours so I needed some help with sound treatments from echo buster's Mike Kochman .My biggest thing about the Thiels is the holographic soundstage it is as deep and wide as I have heard yet very realistic in it's presentation Good luck John

Sounds like you might want to indeed try your Mac amp with those 7.2's, should you go that route. Then at some time, compare a slighly more extended/agressive amp for comparison, like the Krell is. I personally like the Pass amp's on the Thiels. X350 or mono's is good on the 7.2's.
I think the Krell's would do better on Revel's byenlarge. But you gotta tinker. It's called "tweakin'!"