I have a liking for KSC pistols, but in the care of the 1911, I would probably go TM just because of the availability of aftermarket parts. You may find the odd part for other brands, but nothing that comes close to TM.
Although if you're willing to do some light upgrades, KJW 1911 are TM compatible, and that starts you off with a metal frame and slide (metal frame being the hard to get part). You can always upgrade with a high quality aluminum slide and other TM compatible aftermarket parts down the road. But if you want something that will work out of the box with no tomfoolery required, chances are that TM is your best bet.
Just as a side note, I'd personally go Hi-Capa instead. Those TM mags have real crap gas capacity.