Looks like a typo there John. You probably meant:
The two six volt pairs should give 464 amp hours..... (I use 440AH as a generic number).
OPPS. Sorry about that, and yes, you are right, Thanks for the catch and the correction
To the OP. Though you can buy a pair of 12 volt batteries for about the same price.. Odds are they are on the order of 83-100 AH each, so you end up with LESS capacity
In terms of Bang for your Buck,, (Amp hours per dollar) it's hard to bead golf cart batteries
In fact With Golf Cart batteries we speak of Amp Hours per dollar (You can currently get about 2 AH per dollar, 3 if you get a sale, avoid Sams, batteries are CHEEPER not cheaper, Costco is good batteries)
But with some battery classes (Optima for example) I'ts more like Dollars per Amp Hour.