ok that helps...
$350 tops with lipos and a charger, right?

I was going to say the Aquacraft Revolt30 is one heck of a Mono!
with a prop change you can see low to mid 40's out of that boat, and it's a real racer built by a true racer to boot!

but RTR its abut $340 and you need Lipos along with a charger