Alternative to Optima

[WSSix]

I'm not too happy right now. My 3.5 year old Red Top that mainly sat disconnected from the car is no good. I'm having a real hard time justifying spending $200 again on another one considering it didn't last any longer than a normal AutoZone battery. Hell, AutoZone will prorate their stuff after 3 years even but not Optima. So what are my options if any? The battery sits in the trunk. I don't have it in a box with a vent so I believe that means I have to use an AGM battery versus a liquid battery, correct?

Thanks

Sorry for the bitch fest but $200 is a lot of money to me and I expect more for the premium price they ask.