Re: A good top post battery
 

Rick is correct about the SR 59. They're a little pricey, but a sealed unit with a good warranty, and original look.

Re: A good top post battery
 

I use an AC/Delco top post battery with a battery topper on my Caprice. 99% of the people that see it don't realize it's a topper. If you do intend on using a topper buy the topper first and take it with you to get the battery. The spacing of the posts on some Delco batteries are different. Here's a pic that shows a good portion of the battery and topper.

http://i1.tinypic.com/6jui93r.jpg