Thanks Neil, and everyone else for the suggestions.
I made some rounds and Dick's had a decent Sentry for <$400, but I think I may go with this one, a Stack-On 10-gun safe:
On sale at Sport's Authority for $319 w/ 15% sale ($271), and have a $50 gift card, so $221+tax. Since GG, the BATFE, and Bushido Tactical are taking all my money (willingly), I figure I can go slightly cheap on this first safe just to get the guns some protection while I work on filling up the safe...
I only have 4 long guns and 3 pistols so it will have some room leftover...
Any experience with this safe? It is definitely on the inexpensive/cheap side of safes, but better than nothing and not made out of sheet metal with a key lock...
Any words to the wise? Dehumidifying device? Maybe a self-adhesive LED light for the interior?