*rolls around* Mangs I know right? I'm getting closer to having one in my home everyday I bring them up. My dad loved our Bettas and I'm hoping I can get him on board to get a new one and its proper living quarters. <3
They can be taught tricks, recognize their owners, have distinctive personalities, play (ie: ping pong balls, buttons, bottle caps), they wiggle around when they see the person/s they love (and they DO love)... they are basically dogs in tanks. Give in to peer pressure. 8D
Its okay to have males in a divided tank. They'll flare at each other for a while, but they'll eventually realize that their neighbor is there to stay. You could also get mesh dividers to help with visibility :3 Flaring is good exercise, but sometimes too much flaring is a bad thing and can tear fins.
Lawls, betta talk makes me want more too xD
Edit: And I THINK you can put guppies in with a betta, as long as there are 6-8+ guppies. I think. Don't quote me.
I'm not sure about the guppy argument. I don't know enough about tank sharing to give you my opinion, honestly. I do know that occasional flaring between males is healthy though, so if they do it every now and then, I wouldn't worry too much. If they do it CONSTANTLY, then you have a problem.