I'd go to local petstores first, see them in action be prepared you might be a little heartbroken at the cups but what I do is look. See who calls out to me.
If they react like a healthy betta (IE: Ramming against the cup, flaring at their neighbores, bubblenests.) And won't let me put the cup down without feeling regretful I bring them home. That's how at least Akira and Kai got me.
Maka...I felt so drawn to her but even though I lost her I regret nothing.
I adore crowntails though! I used to be an HM fanatic but fell for CT's. I like veils too but I like unusual looks.
EDIT: Just saw that CT...DAMN! That is a GORGEOUS fish! He's like...A piece of art!