The High Lift will definately perform better for lifting the grass and mulching. The idea of the heavier blade is mostly extended life and durability.
The normal blade I fealt would serve you better if you intended to leave the mulching kit in place. If you want to discharge and mulch the Gator is for you.
As for the price I realy cannot say unless I know specifically which part number you were going to purchase.
You did not find pricing or a cart on the website because we do not sell directly to the public. All of our sales is done through two step Distribution. You will need to buy from you local dealer.