He's awesome--I love that coloring! Great pix, too.
Right now I have my little betta girl in a 20 gal but she has to share it with a platy and some small catfish. She loves all the room and is really thriving in that large environment. However, many people seem to have bettas in 5 gals and they are fine. Here's a pic of her in the 20--

Angeleyes
She looks white but is actually more of a cream color.
You will love having a betta I'm sure--they have so much character.