Dewalt glue gun from home depot has been my go to. Heat really quick and has enough oomph for long jobs.
I'm with Rockyboy though, the more I build the less hot glue I use. Most of my builds now are gorilla glue. But you can take advantage of hot glue and gorilla on the same plane. Since hot glue is so much heavier, sometimes I'll use it on the portion of the plane in front of the cg, and gorilla glue behind the cg. Since a lot of planes tend to be a built tail heavy, this usually alleviates the use of any extra weight to balance the plane.
Anyway you go, have fun!
I have the Dewalt as well, and that sucker is GREAT. Heats up well, lets me run nice, long, hot beads of glue. I have used it to build every one of my planes, from the Bushwacker to the Sea Duck to the Mini Twin Sparrow and more. I even used it to make 40 chuck gliders over a weekend during Maker Faire, in May. It is a WORKHORSE.
My dad bought an Adtech Pro from Joan Fabrics, when they had a 60% off coupon plus some other discount; made it like, $12, if I remember correctly.
That gun has a stand, dual temp, heats up quickly, plus it has interchangeable nozzles, to get into narrower spots and a flat tip to lay a thin, wide spread. Haven't tried the wide spread tip, but the long narrow nozzle works GREAT at getting into some of the tighter C folds of the fuselage.
I would recommend either one of these guns if you plan on doing more than 1 build. I've bought a couple of the mini guns for kids to use when building some of the chuck gliders, just because the bigger guns like my Dewalt or the Adtech pro are a little more unwieldy; the mini guns work ok, but they take time to heat up and aren't as good at maintaining temperatures as the bigger guns, I'm finding. Then again, I paid $1-$2 for those mini guns, so, I figure, "Hey, you get what you pay for, right?"