That H8 does look a bit closer numbers wise. Currently our cars (with stock battery) should be set at 90ah. The one I got will be 73.5 (so round to 70 when programming). The H8 comes out to 97 so it would require a change in the programming regardless... Not sure if its worth taking this one back over that or not.
I read up on AGM technology here:
http://www.windsun.com/Batteries/AgmTech.htm
... and it looks nice but maybe not quite necessary... What are your reasons for going with the AGM tech?