Honestly, I did not know there were different species until I read that in your thread. So I'll be of no use to you. Still, I think ramshorn snails are a very good option. I had some algae in my 3g that nothing was working on. It was driving me a little batty. I tossed two ramshorns in and they had it cleaned up in no time. I don't worry about them overrunning the tank because biology dictates there will only be as many as food allows for. So if I do my part and let them do theirs, we should get along just fine. I've seen them on my plants eating algae off the leaves but they've not harmed any of the plants themselves. Win/win as far as I'm concerned and they're a little more sturdy than otos. Though I DO have an Oto in the tank as well that I rarely see. LOL
Mailed it Tues morning. Delivery is supposed to take no more than three days. If you don't get today, you had BETTER get it tomorrow (and you should complain if anything is damanged or dead since it took them too long).
The cories are the "garbage crew". It's always good to have a bottom feeder of some kind to eat all the food that the betta misses. Cory catfish or kuhli loaches are great for this. For algae, I always hear that nerite snails are the best thing to get, though I've yet to try them out. Ramshorns and mystery snails don't seem to have done much for me though on the algae front.
I have found the extra room in my 30 gallon is pretty fun.
For the drive home, is there a way you could leave the plants/gravel in the tank with a bit of water and put it inside another container with all of it's accessories? That might be easier....