Hey everyone! New to the hobby and everything (to get that out of the way...)

Got a Rustler VXL, took it down to the beach yesterday and fried my ESC, so I have 2 questions:

1) Would you recommend I replace it with the stock VXL-3s? Or should I get something different? (Unfortunately I'm well outside the 30 day warranty)

and 2) What is a recommended gearing for the beach? I didn't think stock would be an issue, but apparently I was wrong...