Dollar per Amp hour with those things is tough to beat. If I had the height in my box to fit 'em, I'd definitely go the Costo/Sam's route.
Also, I would bet that the plates get thinner when you get into that 232 range. Or... taller... which would mean less room at the bottom for sludge to build up before becoming a problem.
If so, you would be sacrificing longevity for a little capacity. However, for some, this may still be worth it.
That said... if you have the room... for roughly the same outlay... much better to go 4 Costco GC2s than 2 of the 232 Ah units.
EDIT:
OK. Just saw Roy's photos. Looks like you may have 220s... if your scale is accurate.