so my battery light was flickering on and off last night, and from what i've read, that usually means the alternator is on it's way out. so i might as well replace the battery while i'm at it, too. which one do you guys recommend? i've been looking at either an Optima Red Top or one of those small Odyssey batteries (only 15 lbs). what do you guys recommend would be better? my car is mostly on the street and sees the occasional run at the strip...