Wal-mart Everstart 1000 Cold Cranking Amp. I've never had one let me sit. Ever. Even if you leave your radio on all night WITH an amp (trust me I've done it lol).
Best thing about them is that there is a 3 year warranty (a no b.s. warranty) so every 2.5 years I take my battery back and get a new one for free. Plus they're only around $90 new
Does anyone know what they changed in the optimas? I had s yellow top deep cycle in my off road jeep for 6 years now and was gonna put one in the ranger