I would be looking at the 998, but again its all about the most bang for your buck. You have to set a budget, and if the unit falls into your budget (or close to it as long as the wife doesn't find out) then go for it.
If the 998 is out your budget, then the 898 is the better option. Faster processor, video out, and newer technology!
Also, talking about price, most of the internet retailers will come off their advertised price if you call them direct. J and H Products is very good along with Three Rivers Marine.
Good Luck,
Robert