I'm looking to buy some extra blades for my newer Exmark mower. I've searched at 4 different places that sell them. The dealership is considerably more expensive, with the online sites being much cheaper priced. What are some of the things I should consider when choosing where to buy from and exactly which blade? I've noticed that the thickness of the blades varies, but what are the pros and cons of thicker or thinner blades? Also, what kind of cutting difference will you get between the types of blades, such as the gator mulcher or wave mulcher, or just the standard blade that came with the mower? I cut mostly fescue and have been pretty satisfied so far with the blades that came with the mower. Any suggestions?