I bowl in 2 different leagues, one league starts with a medium oil pattern and breaks down from there and one starts with heavy oil. I tend to throw it down the right side of the lane and then have it hook into the pocket. I can only afford on ball at the moment. Anyone have any advice on a specific ball or type of ball I should look at?

Do you have a spare ball already?  In general you are better off speaking with a good bowling pro shop operator in your area (ask around who people use if don't know one) instead of relying on a bunch of ball salesmen on the internet.  He/she can get your stats and or watch you bowl and make a much more informed recommendation.  Plus he/she probably knows the houses you bowl in and what works there.