At the minimum I recommend those $5 gold plated set of posts. When I switched over, my cranking went from about 2 seconds until starting, to about 1/2 second. It was as if it was cranking over several times to starting on the first turn. This has to be worth the reduced wear. I can only imagine how beneficial this could be in a northern climate when its COLD out. Might get that one or two extra starts out of it when the battery starts to go.
If you aren't adding in a large stereo, second battery, or a bunch of auxiliary electronics, you really don't need anything more than that.