Which Optima?

Ok guys, my battery is gettin pretty low on starting my truck (turns over slow when cold). Looking at getting an optima battery for it and wondering which one I should go with. I was looking at the red top one. Not sure now though, any help would be greatly appreciated. Thank you in advance.

Red for normal operations. Yellow for extended rundown, like stereo play(with big amps) without engine running.

I was thinking red. But I wanted to put an amp and sub in it later on down the road

You should be fine with red.
If you had a competition stereo system, yellow would be a must.

I wouldn't go competition just want to make her sound good for the stereo and have enough juice to keep everything from dimming on me and for the starter to turn over how it's spose to not turn slow. Thank you for the info.