Well, it is really up to you. There are obviously some advantages to buying one of these gel batteries - I am assuming that is what this is. But if the only thing you are concerned with is avoiding corrosion caused by leaking acid, then you could probably just grab a lead-calcium "maintenance free" battery at a much cheaper price - these are sealed, so they can't leak and they are more resistant to corrosion.

One the other hand, the gel batteries last much longer and can be deep cycled several times without killing the battery - they do have good qualities, which is why you pay so darn much.

Personally, I just go with the mid-range. A lot of batteries now have 1 year full warranties and then are pro-rated for another 5 or 6 years, just hold on to your receipt.

__________________
'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
______________________________________

"Back off, man. I’m a scientist” ~ Peter Venkman