I'm thinking that next skills I get (excluding lurching gait and possibly ankle grab) will be basic firearms training, basic pistol training, shopping, then the rest of the firearm skills mixed with bargain hunting at some point. Even with just shopping, you are better off searching a mall than a PD, since you don't have the chance of getting a flack jacket or a flare gun, you can only get guns and ammo. I've currently got hand to hand, axe, diagnosis, and free running, so I've got good melee skills, mobility, and the ability to see when somebody needs healing. I'm not so worried about barricades, we have quite a few people with it, and the other people at the St. Matthews/Siricius location have it as well.
Now I just need another 70 XP or so to get to the next level.