I have Angela's old 270 and I've been happy with it. It is a beast weight-wise, but I've been pretty happy with it. The trim, as someone else mentioned is pretty "crappy" but I honestly just ripped it all off (the hood and stand covered it anyway). I also own 2 of their half 15 tanks for frag swaps and they've been great for that. Their silicone is a little sloppy (as everyone has said), but again you're paying for what you get. As long as it holds water and I can be pretty sure of that, I'm not going to be incredibly concerned over what the silicone looks like.
My only comment is that you might be able to find a mass produced tank (i.e., not custom) with similar dimensions to those you are looking for. The smaller the tanks get the less competitive GC's prices are (unless they are really custom job or have really weird dimensions). If you're looking at shipping to SC, you might be able to get more tank for the same price if you just shop there instead. If you do need it really customized, then I'd say GC is the way to go... just know what you want when you call.