If you're going to do your own lighting and are looking at 29/24gal, I'd just suggest a 30G cube. You'd probably enjoy that more. Although 30gal is borderline to even be considered a nano.
I bought some glass today for partitions in my sump I'm making. If its the all-in-one design of a nano you like, I believe you could easily buy a piece of glass cut just the right size to create a back compartment in a 30gal cube that you could use for filtration (ie nano cube style). If you hit up a small glass shop, you should be able to get a good deal on it. I paild about $10 for 5 pieces of 1/4" glass cut. 3 of them were 11.75" x 12".