I am looking to build a Great Planes Cessna 182 Skylane and am looking for an engine that works well with this model; however, I am on a very tight budget. The engines I am looking at are as follows:

O.S. .40 LA
O.S. .46 LA
SuperTigre GS-40
(All engines with Pitts style muffler)

I realize four stroke engines are ideal for scale models, but I am not in a financial position to purchase one. Which one of these engines (or one I have not mentioned in the same price range) will give me the most reliable, scale-like performance?

Thanks