I have had very good luck with the Optima Red Top batteries. It can sit for a month or more, no battery tender, and still deliver plenty of cranking power, even when several years old. I am only on my second one in 8-9 years of buying the first one.
Some folks balk at them because they don't look stock (the red is funky looking) but I could care less, so long as I can rely on it. Someone already said it..... from the drivers seat at 70mph it looks just fine.