I have two SP101s, one in .327 federal magnum and one in .357 magnum, I also have a 4" GP100 and have owned a model 60 LS, several 686+ in different barrel lengths and have to say I like the .327 federal magnum sp101 best for carry.
The model 60 was a good carry gun and it being made of stainless made it relatively fun to shoot at the range even with .357 magnums, I really liked it but traded it in a good deal to a friend. The sp101 is a great substitute, the 3" barrel length helps with sighting over the shorter 2" barrel the model 60 had and I really do like shooting the .327 federal magnum. For me, the cartridge combined with the weight and the feel of the solid sp101 really make a great carry piece. I don't feel that way with the .357 magnum for some reason, even though it is exactly the same in dimension.
Out of the three choices you have, I would personally go with the model 60 with the three inch barrel. The gun is compact enough to carry well and it is put together well, just make sure you check cylinder gap clearance. It seems like smith is sending some of these out with ridiculously large cylinder gaps, but some are just right. The 3" barrel will help you sight quicker over the shorter barrels and the gun feels balanced with it. I actually like the grip of the model 60s, but if you don't there are aftermarket replacements. Good luck.