The terms "XC", "AM", and "race bike" all balled into one has some conflicts, especially when seeking a more upright riding position.
XC race bikes will have a more stretched out/lower riding position. That is one of the things that makes them more suitable for racing. Bike companies don't generally make their best racing frames with a more upright riding position in mind. The taller head tube mentioned by Bruce is something that some larger performance oriented frames will have, but if you're going to push the performance envelope riding a frame with a shorter than normal (for your size) top tube, there will be compromises when riding at race speeds when you have to get your butt up off of the saddle.
As soon as you get up off of the saddle, you're either going to up over the front which makes braking hard a less than fun experience, or you're going to have your weight so far back that you'll be using a lot of arm strength and energy to hang onto the bike as your foot position will be more like a fulcrum than a position of support.
If you're just cruising along and can stay on the saddle at the speeds you're going, then it's less of an issue. But if you're racing or riding in a 'spirited' manner, it gets dicey in a hurry.
Now, when you throw in the "AM" component of the proposed equation, that is where I am really thrown for a loop. The qualities that separate an AM bike from an XC race bike are what make one less than optimal for use as the other.
The bikes you have listed are all over the map as far as design intent:
1) Specialized Enduro 29er?
2) Santa Cruz Tall Boy?
3) Ibis Ripley?
4) Scott Spark 29er?
5) Specialized Stumpjumper 29er?
6) Rocky Mountain???
7) BMC
It sux to say it, but any bike that makes concessions to feature a more upright riding position that accommodates your situation, will make concessions to it's ability to truly "rip it up". Pretty much every aspect of bike fit has to make concessions to other aspects to get the best combination of compromises that all work together. In other words, they are all interconnected, and when you mess with (change) one thing, it messes with (impacts) at least one other thing. That said, I would probably look for steeper seat tube angles, and taller head tubes, and then saddle position, stem length, handlebar shape and size, and likely some other things can be somewhat adjusted (and will come with tradeoffs in performance). And you're likely to have to do a LOT of test riding to find your best combination of compromises to suit your situation.
Good luck and I hope you can find something that suits your purpose(s).
