Battery threads are almost as bad as oil threads...

If it was me I would either get the dealer battery or I would call up my local Interstate Battery dealer and get a quote from them. Some people will say go to Costco or Sears or whatever which is fine, but the only problem with that is they don't sell the same batteries in every location. They sell whatever is made in that region. You can look at Consumer Reports but their results on batteries are usually all over the map. Also, freshness is very important. You want to check the date code which is usually stamped in it somewhere and make sure it is no more than 2 months old.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra