I just went through this in october and went with the 897D because of the versatility and the larger screen. It is easier on the eyes as well as the knobs are much bigger. It sounds good, but add an external speaker for better sound. I also purchased the LDG AT897 tuner which is great. I feel you might be happier with the 897D, if the budget can absorb it.. As far as batteries, I added the Gamma Research power supply instead of batteries.
www.gammaresearch.com See their website for details. Greg