Gotta second those Tans... I have a handful of them, and they are such a fun, active breed. Since I have so few bunnies, it's easier for me to do solid bottom cages with litter boxes, so my Tans live in 24" by 36" dog crates. I've found that the breed does better on wire, however, so using stackers is a fine idea. I like a little taller cage than average (I think most breeders do 18"-20" height...); mine are 24" high which gives them plenty of room to stretch up. Your set up drawing looks perfect for a small herd of Tans.
I've played with Rhinelanders in the past, and while I absolutely love the breed, I won't raise them because I can't bring myself to cull the mismarks- And you get a lot of mismarks with the Rhines (not something you see in the Tans). They've got awesome, dog-like personalities, but they need a lot of space; I wouldn't do less than 40" by 40" stackers. They are a great breed if you have the space and dedication for them.
Like woahlookitsme said above, Belgians aren't a running breed, and they need to live in large cages on solid flooring. I've admired these guys for forever, and finally got my first pet one last month. They are a gorgeous breed with great personalities, but because of how rare they are, the gene pool is limited and you see a lot of health issues in these guys, namely terrible respiratory issues. They are super fine-boned, and broken legs, feet, hocks and tails are not uncommon. They are not a breed for the faint-hearted.
Woahlooksitsme gave you a few names of some awesome Tan breeders! I encourage you to join the Tan Breeders group on Facebook, as there are a lot of great members on there who would be to happy hand out advice on the breed (I don't post on there, but I do lurk!). I'm in central Virginia and will most likely be selling out this summer to go back to school full time, but if you're ever in my neck of the woods, I'd be happy to point out the breeders in my area who I like to work with.
