Go for it.
I don't think I've heard the x10's referenced as a "top-tier" IEM in awhile, but the MTPC received acclaim across all of HF. I personally have the MTPC and love them. Though, the only gripe I would put against the MTPC is the poor Quality Control on them. I have to send my 2nd pair back due to the left driver losing bass.
But that's what the Life-Time warranty if for . If you have any Q's, shoot me a PM.
Klipsch X10 have gotten a bad rap based on their original price point, and to be honest the SQ with them is outstanding - just maybe not for their original price of $399. As they get cheaper their reputation will improve no doubt, but you can't really say that they're technically inferior to MTPC when it's comparing apples and oranges (BA vs. dynamic). You mention the lifetime warranty making up for the frequent breakages, and that's fine if you're happy to keep shipping back and forth with Monster every 6 months or so - but I prefer to buy something once, and then keep it. YMMV I guess.
Having both, I can tell you IMHO the MTPC are the better sounding earphone. Bass is just as punchy and controlled, mids are more detailed and lush, highs have better extension and control. Soundstage and instrument separation are also slightly larger with the Coppers. The only thing the X10 has going for it is its small form factor.
Again these are my opinions using both out of my p3+. Have not compared unamped. Hope this helps.
Edit: Also I have had mine from the original release and have not had any problems with build quality. Not to say you wont, but I'm very pleased with the quality of both my Turbines.