Their have been complaints re the 895 vs the 819 as far as longevity. I was concerned about this as well when I replaced ours in '10.
I replaced the 819s with 895s at the recommendation of a local batt supplier who carries both. They were $207 each (x 8) in 2010 so the prices quoted don't sound out of line. I asked him about the 895s and complaints; he said his shop had no issues with them and they supply a lot of batteries for marine applications in the central Ches bay area. The shop has a good reputation and I decided to take him at his word, figuring he would know way more about it than anyone else. The price included delivery of the batts to the marina/dock but not onto the boat.
The 895s have slightly more capacity than the 819's but are smaller/lighter due to the design. If you remove/install the batts yourself, I guarantee you will really appreciate the 895s!
HOWEVER, since I have only had the batts for not quite 2 years, I have no idea yet re the longevity. I try to properly maintain them, including water level, periodic EQ charging, and use of a very smart charger - the Outback 3232 inverter/charger.
I always said that when I needed new batts I would put Rolls in - as did Hatt originally. But when it came down to it, it was just too much money at the time. OTOH, the original batts in our '80 53MY lasted 15 years. In '95 the PO installed the first set of Dekka replacement batts...it's on it's 3rd replacement set since then so the Rolls are probably a better deal if your wallet (and your back) can handle the strain.