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If you're looking for slimmer and lighter for IWB carry, I'll suggest the Walther PPS (9mm or .40). I'm 6-1 275, and when carried IWB in a Crossbreed Supertuck I can often forget it's even there. I actually like the grip and the aiming point/line is very natural too me. Plus, the PPS is basically a ripoff of the Glock mechanics, with which I'm already very familiar. Mine has been 100% reliable after initial break in and the trigger has smoothed out to a nice 5-6 pound pull, just slightly stiffer/grittier than a stock Glock, but not as long or mushy feeling. I still don't like it as much as my Glocks, but it is easier to carry and I am plenty comfortable with my ability to shoot it very well at self-defense distances. This is my go-to IWB belt carry gun, and the only gun I'm truly comfortable carrying "tucked".

But I do completely agree with others: carry the pistol that fits you from a shooting standpoint, not necessarily from a wearing standpoint. If you can't shoot it well, don't carry it.

I also love my little LCP, but it's a last-resort gun. I still put my J-frame Smith & Wesson ahead of Elsie Pea in the pecking order.