I'd go for a 5w-40 over the 10w-50. Pretty much the only Hondas that need anything thicker than a 5w-40 or 10w-40 are heavily modified ones with oil consumption problems.
Cheers
Tim
It's down to the oil temps really, if it's getting over 130C, then a 10w-50 is a better idea than 5w-40. I would think that you'd probably need a turbo on there to get that sort of temp.