Oops, sorry I didn't reply.
It really depends on what you want to get. I got the 60 because I new if I upgraded to a bigger tank, then I'd need the extra power, plus I kinda wanted two outlets. You could even go with a 100 for your 10g, but if you're not planning to upgrade in the near future, then you should probably just get a 10. It's only 6 bucks!