^Two T-105 Plus batteries connected in series will give you 225 AH at 12 volts, which means that if you only draw 100 AH out of them between recharges, they should last for many hundreds of cycles.
Given proper care, there's no reason why those conventional flooded-cell batteries won't last just as long as a good set of AGM batteries.
Biggest disadvantages are that:
1. They can only be located someplace with good ventilation,
2. They don't accept high charging current as well as AGM batteries do (which means that you can't rapid-charge them as quickly),
3. They require occasional water replenishment and terminal-cleaning.
If you can accept those limitations, they are an excellent choice.
ETA: $215 apiece sounds way high. I assume your local dealer has better prices?
