Both the frames and slides of the Kimbers (even the most basic models) are extremely high quality, they are made at the same plant as the Wilson Combat slides & frames. People have some problems with the small MIM parts Kimber uses to keep their costs down sometimes, but the frames, slides and barrels are all top-notch. If I was going to have a full-on custom gun made and couldn't use a Caspian frame, I'd start with a basic Kimber Custom (as low as $600 from what I've seen) and keep the slide/frame/barrel... then replace the other internals & other goodies with top-shelf stuff. As long as there isn't some gross defect, the slide/frame combo won't have much of an impact on performance... stuff like the barrel quality, barrel-to-slide fit, and good quality "guts" installed properly are 99% of the game.