Personally I'd go with the 19 as someone else has suggested. I can't say for certain that it's only mine, but I've had quite a few headaches with my KSC G17. It came with a preupgraded metal slide, and I've upgraded the recoil spring and magazine lock but I've had trouble with gas blow off's (valve hammer locks and blows off the entire charge), and jamming problems. Also, the hammer assembly in the bottom half seems to be of very poor quality, as I can feel rubbing (read: grinding) between metal parts when I operate the trigger (with my thumb on the hammer, mind you). I don't want to be so quick to condemn an entire brand for my bad luck, but I've heard better things about the 19 too. I just wish I had that info before I bought mine.
P.s. anyone wanna buy a cheap glock 17? it works great. yea yea, thats the ticket...
(edited for factual content