my recommendation would be a Spiketail Paradise Fish (Pseudophromenus dayi). They're cute, eventually interactive (once they trust you) and hardy. Also, none of your pals will probably have one . . .
Usually in the $6 range, from my experience.
Also, they aren't as generic as most run-of-the-mill betta.
You can also get them pretty readily on-line. Aim for a male, throw in some hardy plants, maybe a couple pygmy cories (if you can find them) or some shrimp and make sure the tank is covered.
At least take a look at these lil' guys . . . I think they're a blast . . .
Kev.