I've always just gone with Group 24 in my Nissans...usually Walmart Everstart MAXX (Group 24, 700 CCA, 3-years free replacement plus 2-years pro-rated) which run about $100 after core return. Made by Johnson Controls and always highly rated by Consumer Reports. Plus, if I ever have a warranty issue, there's always a Walmart close by. However, earlier this year, I went to replace the battery in my 1st gen and they were out of stock in the entire state of Virginia (they did have them in stock last time I checked, about a week ago). I ended up getting an Autocraft Gold (Group 24, 700 CCA, 3-years full replacement warranty) from the local Advance Auto Parts, which is also make by Johnson Controls. It's not my first choice in batteries, but with an online discount code, it cost only $84 after core return. If money were no object, I'd go with an AGM battery, but that's an awful lot of coin to me and the majority of my driving is on the highway or paved roads.