I am a loach noob. In my ignorant fishkeeping years, I had a five clowns and a Dojo in a 29 (the poor babies died to the red-tailed shark from hell in under a week), a Blue Boita alone in my 90 (he's now living with 15 others in a 210 gallon with a good friend), and a solitary Dojo Loach named Gandalf that lived with me in my 20 gallon long community tank for five years before I gave him away to the same friend who got the Blue. Despite my atrocious fishkeeping habits (I've gotten better, I swear, thanks to several patient forums), I've been amazed by the activity, playfulness, and general awesomeness of the loaches I've cared for. I'm hooked, and I want more, and after a move, selling my old tanks due to having to move back with my parents, I'm in a position to get an aquarium again.
Due to size constraints in my living conditions/odd landlord rules on what constitutes a "pet", I'm restricted to a 29 gallon (or less, but that means I'm getting a 29

). The only stock list I have is whatever loaches will fit, plus maybe some danios or barbs for variety (but the non-loaches aren't necessary). I'm planning on a sand substrate, rocks, driftwood, lightly planted with a little Java Fern, but very clean and river-ish looking. It's definitely going to be overfiltered with an appropriate sized cannister and a HOB (I have awful luck with filters, & I prefer having 2 so I can overfilter and have a backup in case I kill one), and I'd prefer it to be slightly understocked. The going plan is two 25% water changes a week and a 10% as often as I can get it in.
My question to all of you is what loaches should I get based on the following criteria?
1) I'd prefer deeper bodied botia style loaches (If I had my way, I'd have a giant tank of B. modesta), although I'm not opposed to other sorts.
2) Fits a decent school of at least 5-6 in a 29 gallon (36"x12"x16" aka standard size)
3) I understand loaches are nocturnal mostly, but I'd like some that came out in the day too
4) Friendly wet pet personality
5) Preferrably relatively common in the pet trade. I don't want to get fish shipped to me.
I've been thinking of Zebra or Skunk loaches, because I've seen them in local stores. I'd love either input on those two species as to how many I can have in a 29 gallon, or suggestions for other species that would work for me. I'm not opposed to Kuhli loaches either. Also, I'd love to hear what other tankmates I could get. I have a ton of experience with Zebra Danios (love them), so they're the more likely tankmates, but I might try my hand at Tiger Barbs or something (suggestions welcome here too).
Anyways, thanks in advance.