I get nervous at the 3 year mark since I've had a few OEM batteries die right around there. As for the optima you might want to look at the odyssey too. Cost a little more but I think they are a much better battery for heavy duty use.
ODYSSEY Batteries
Here's a nice video
Stang TV : SEMA 2006: Bruce Essig of Odyssey Batteries at SEMA '06