The major sandwich chains I can name that have locations within 10 miles of me are:
Subway, Quizno's, Jersey Mike's, Jimmy John's, Which Wich, Potbelly, Firehouse Subs, Schlotzky's.
I've eaten at all of these at one time or another, though I doubt I've been to any of them within the last year. Maybe Schlotzky's, my son really likes those, but now that he is driving, and working, he can go get that any time he wants all on his own.
I've also heard of Blimpies but there are none in Austin and I've never been to one.
There are two Austin-based sandwich shops that I eat at a lot more regularly, Thundercloud Subs and Delaware Subs. They're much higher quality than the national chains.