I have sold batteries for over 20 yrs. Not auto parts and batteries, just batteries. I sell East Penn, Exide, Trojan, Optima and Odyssey. There are really only 3 major manufactures of lead acid automotive batteries in the US. JCI, East Penn, and Exide. Of the 3 I believe East Penn makes the best batteries. They are labled and sold all over at different part stores. The battery I run in my cars is the Odyssey PC1200, you will find them in a lot of show cars/race cars. I dont have data to back up my opinion but I do have experience and the quality of Odyssey batteries is 2nd to none but they come at a premium. If you want the very best spring for the Odyssey but to be honest unless you have a really high compression motor or just want to be different a East Penn acid fild battery will serve you just fine. I didnt bother reading through the other post but it looked loke it got off track quick and I dont have a dog in that fight
I wont tell you where I work or push my stores but I think if you go to East Penn's website you can find a list of dealers. If its just a stock car stick with at least the minium manufacture requirements and you should be fine.