Thanks to everyone who's responded so far! The drawbacks of an AIO system aren't lost on me, but I'm still pretty set on it because of the office setting — even if it does mean buying my own lights (and I like Blink's idea of selling off the stock lights.)
Extra thanks to dubels for the filtration warning. I think I can get by, since I'm pretty big on water changes and I'm not planning a lot of animal biomass (most of the fish I'd want would obliterate my shrimp.) Any tips for getting the most out of the limited space, though?
The Nuvo costs $350, by the way. Definitely not cheap, but it's within my price range, and looks do count. That said, if I could find something comparable for a lower price then I'd have that much more to spend on plants and stuff!
The Fluval Edge is cool, but since I'm breeding shrimp I'd frequently have to get in there with a net to do my culling. Seems like that'd be extremely painful with the Edge's limited access.
As for the Fluval Ebi and other smaller tanks, I just really like having a bit more space for aquascaping. My grass will need a lot of pruning in the 16-gallon, but in a 7-gallon I think it'd end up just looking like a jungle.
I've also looked at Coralife's AIO tanks, by the way, but the bowed front and heavy plasticky rims just aren't what I'm going for.