Honestly, if you are decent at building, you'd be better of building a custom tank. That way you could make to your desired measurements and save lots of $$$.
Glasscages carries a 125g wide style (72"x24"x17") for $260, that would hold them for a while, esp. if you split them up between 2 tanks that size. You would be good until they were up to around 16" long.
I would pay someone to build the tank in your house, might be cheaper than buying a large tank. Id go with acrylic for sure, a mature ATF can easily be a tank buster.
