I went with the Odyssey 34R-PC1500 --- Cold Cranking Amps (CCA) 850
SPECIFICATIONS
Pulse (5-second) Hot Cranking Amps (PHCA) 1500
Cold Cranking Amps (CCA) 850
20Hr Nominal Capacity (Ah) 68
Reserve Capacity Minutes 135
Dimensions L x W x H (in) 10.85 x 6.76 x 7.82
Metric Dimensions L x W x H (mm) 275.59 x 171.7 x 198.6
Weight (lbs) 49.5
Weight (kg) 22.4
https://www.odysseybatteries.com/pc1500rt.htm
Be sure to do your research on AGM batteries, as there are issues with modern cars with variable voltage alternators like our Xterra not supplying as high a voltage as some of the AGM batteries would prefer in order to maximize their service life. I have a OEM AGM BMW battery in my wifes MINI, an Autocraft AGM in my Viper, and the Odyssey in my Xterra. I have to top all of them off once a month and you MUST use a charger designed for AGM batteries. The Odyssey is the pickiest (their 31 series batteries REALLY need the 50 amp charger), and according to Odyssey even the 34 needs a 50amp AGM charger which Odyssey stopped selling in 2015 (wtf). I talked to an Odyssey rep at Barrett Jackson a few years ago and was told the best I could do now was to go with the CTEK MSX 5.0. That is the smart charger I now use to charge all 3 of my cars. I used to run the Diehard Platinum AGM back when it was a rebranded Odyssey (no longer available), and it died after only 4 years because I didn't know this info. Its a bit of a pain in the ass, but at the time I bought it (Jan 2018), I felt it was the best I could find. I really need to look into what would need to be done to have an alternator that would put out the exact voltage the Odyssey likes (14.8 I believe, but can't remember for sure). The Xterra only gives 13.8 to 14.2 from its alternator. But....thats for another thread! With both of you being in Canada, I would look into Bushnut's suggestion with his Canadian Tire AGM with 800cca. I hope some of this info helps, best of luck OP.