Yeah, usually it works out pretty well this way. Lightning strike is a good solid power, too.
If you want to flavor burning spray to thunder blast or something, that works (Wizards have a power called Thunder Wave if if recall correctly, though I don't think we're in danger of getting confused). Blazing starfall I'd say might be worth it as a second at-will if you had strength as your secondary, but again if you want to take it, I'll allow the re-flavor.
I wouldn't really go for the reflavor on, say, chaos bolt since as I said, lightning is really more of a reflex attack. Technically thunder is more fortitude, but I'll allow reflex too since this is somewhat different.