harlequin rasboras? They are very cool. I think a tank with a few cories (3) and a school of rasboras would be great. You could add the angel, but that would mean fewer rasboras (like 5 or 7 instead of 10) and when the angel starts to get bigger you'll need to make sure that it doesn't try to eat the smaller fish.
The rasboras really like plants...so even if they're fake plants you should plan on getting some