I'm 100% sold on Odyssey brand batteries and have been installing in all my cars and motorcycle. Specifically 75-PC1230 for the ZR-1. I paid $230 over a year ago and now they cost more, but worth every penny to me. Do a search on here for Odyssey and you will see why.
Batterymart is awesome to deal with:
http://www.batterymart.com/p-ody-75-86-pc1230.html
Because our cars seem to not be daily drivers, I like the AGM batteries over conventional lead acid batteries. It is a perfect fit and no issues at all. Best wishes in your quest for a replacement battery that meets your needs.
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ZR-1 Net Registry
__________________
Craig
"ZR-1 NO KA 'OI"
"ZR-1 ICHIBAN"
1995 #228 Black/Black with Dunn Heads
ZR-1 owner since September 2003
ZR-1 Net Registry Founding Member #0074
NCM Lifetime Member #2048