If you can consistently hit a composite 400-500 ft you will have no issue hitting a 300 ft homer with a wood bat, if you don't hit em that far I doubt you will get 300 ft out of any wood bat. I doubt you would see any major difference between an >$100 wood bat (X bat, Marucci) & a $50-$70 bat (Thunder, Easton, Worth, Evil Bamboom). I have a Brett Bro's Thunder and it works great. Personally I think the hybrid bamboo core/maple barrel bats such as the Thunder & Bamboom are the way to go, good balance between performance & durability.
And, as with all the various leagues out there, the type of ball used is going to have a significantly greater affect on your hits then the bat. The higher the core the better.