I have been considering the Glock 29 for similar use too. It would see use hiking/mtn biking and as my normal CCW gun. In California we have a 10 round mag capacity limit, so (for me) I might as well go with the compact version (although I guess I'd lose a little velocity with the shorter barrel). From what I've gather, they hold well, especially with the mag extensions. I've never shot IDPA, though I've always intended to give it a whirl. Seems like a good way to get proficient with your gun as well as a lot of fun. I've never owned a Glock before, but with their utilitarian reputation they seem like a natural choice for this type of use.