What altcoins can 1st gen USB ASICs mine?

[generalheed]

I stopped mining for awhile but am trying to get back into it. I've got most of my GPU and CPU power mining monero and fantomcoin. But I still have a handful of the old USB BlockErupter ASICs as well as a single USB BFL RedFury ASIC. The total hashing power of all of them combined is about 4-5 GH/s. I know for bitcoin that's nothing and wouldn't make a dent anymore. So with that in mind, are there any SHA-256 altcoins that I can still reasonably mine with my 4-5 GH/s worth of USB ASICs? Or would I be better off just selling those ASICs since the value of them have increased quite a bit since I first bought them?