What Sanding Blocks To Buy

I am getting close to start blocking out my fenders. There are so many different sanding block on the market. What would you guys recomend? Is their a good starter kit out there? Thanx...

Eastwoods Dura blocks are pretty nice, and I almost got a set after seeing how they do.
I see they are on sale right now.
Dura-Block 7 Piece Sanding Blocks - DuraBlock - Automotive Sanding Block - Body Hammers Sanding Block

They also have some for the curves in the body, like on the fender tops between the sides and the glass and roof but I used pipe insulation tubing with sticky backed sanding paper wrapped around it and it worked perfect.

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