Not liking the sump? It looks like a nice design. Do you just want an integrated ATO? What do you think are advantages of that? Never thought of them together is why I ask.
They normally don't anymore. They 40 and 55 gallon tanks are usually 50% off during the sale. I picked one up last time for ~$58 after tax. Link I provided above shows what is $1/gallon and which larger tanks are included in the sale.
If you have plenty of room I'd go even bigger then. Sumps aren't expensive, they are easy to find used and the bigger it is the more stability you'll achieve. Also easier to fit equipment.
@Jeff Rehling I have a tank that's been sitting for a while; is a bit higher than a 40B but same footprint. I did cut a notch in the back for an external oveflow; there's a thread about the mod somewhere on the DIY forum.
If you are interested pm me.
Wonder if petco is going to have sand on sale, sometimes it's crazy cheap there, and I think I'm going to put sand in my anemone tank just to keep the anemones on rocks and off the bottom glass (probably can't do anything about the side glass). Although looking there they do have some on sale but damnit if they don't say what's in it, CaribSea Super Naturals? Imaginarium? I've been so out of using sand I don't even know what half this crap is.