Steve,
What kind of LED display are you using? Does it show how many amps the panels are putting off as well as what the battery is taking in?
I just checked with Costco and their 6v GC batteries w/ 220AH @ 20 hours are $79 + $9 core (if you don't have an exchange). I think that 2 of these and an 85w of solar should be more than enough for my minimal electrical needs.
BTW, I checked with 2 Costco's and one had a price of $89 and the other had a price of $79. So, worth calling around.