Figure I may as well toss my two cents into the ring, too...
IMHO, good idea for the original poster to keep the Glock 19. He likes it, it has worked for him and he's familiar with it and likely has holsters, magazines, etc for it. I would recommend simply adding a Glock 26 for slightly greater ease of carry. It has the same manual of arms and identical operation to his original gun, and can even use the same mags. This also gives him the option of carrying both as a system - wear one on the hip, one on the ankle, (or one in a shoulder holster) with a reload or two in a carrier on the belt, offside. The more options, the better.
The LCR is a very nice gun, to be sure, but is it really THAT much smaller than a Glock?
Overall Length:
Glock 19 - 6.85"
LCR - 6.5"
Overall Height:
Glock 19 - 5"
LCR - 4.5"
Overall width:
Glock - 1.18"
LCR - 1.28"
Weight:
Glock 19 - 23.5oz (with empty mag)
LCR - 13.5oz (empty)
So, the only really significant advantage as I see it is the weight. Disadvantages include much lower capacity, greater recoil and decreased controlability in the LCR. The Glock has 50% greater barrel length, 300% the capacity and is comparable in size overall. No-brainer in my book. And, as I said, the Glock 26 is even smaller and closer to the LCR in weight, while still offering greater capacity.
Get an LCR if you want one, but for self-defense I'd stick with the Glock.