I bought the Pro3i plates off of Partshopper here on Stangnet. Haven't installed them yet, but they are really well-constructed. I think they were around $170-shipped IIRC.
maximum mortorsports or pro 3i (parts shopper). I got the maximum ones just because they look stronger to me. if you look at the design of the whay the top plate mounts they are different. it boils down to how important $50. I think the pro3i is a good piece. In my searchin I read of someone damaging one though. the maximum are liftime waranty. I like unconditional lifetime waranty. hense why I got the maximums and will get koni's are bilsteins. now if you are buying other budget parts I say save the $50 and get pro3i.
I like my MM C/C plates, no problems with them. Install was easy. You do have to drill a hole for the 4th bolt but the instructions are easy to follow.