^^ Has already been hit..Tabs are broken and some of it is cracked.

Ok, so I'm now going with the Cobra R style with the lip. I'm seeing urethane, fiberglass, duraflex, etc. Which material should I get?

you want anything but fiberglass, will spider or break easy!

I've read that, but I've also read that urethane will warp and pretty much sag if it gets too hot, and that it just gets out of shape too easily.

Urethane is what you want.

I second Urethane

Bumpers already been bought and in the shop now. will be done at the end of the week. Look in my Cervini's thread, i'll be posting up how everything went in there.