RE: swap prop or replace engine?
IraqVet,
I guess you can expect ~50-60 hour life-span from the P+L, if you use fuel with a lot of castor oil.
Since you wrote in the first post that it had low hours, I guess taking better care of it would be quite beneficial.
50 hours is about 500 flights, which is a few years for the average modeler.
On 5% nitro fuel, you can expect ~11,600 RPM on an MA 10x6 prop.
This is definitely not a powerhouse, but it is respectable.