I like the Glue Gun from Michaels by Aleenes with the changeable nozzels. It is a 40 watt, I use a high temp glue stick by Surebonder from Hobby Lobby or JoAnn's. I love the small tip best, great for hard to reach places.
I also like the 60 watt Surebonder Glue gun, it is so hot you see a steam like effect from it. I use this when I have a large area or something I know will be hard to stick. This I purchased at Hobby Lobby, but also saw in JoAnn,s. I also only use the High temp glue stick in it.