That's a tough choice, but I would go with the 899 myself.
The reason is that the 899 is more current technology and has a faster processor. We don't know yet, but it is very possible that the 898 will not support some future accessories because of the slower processsor. The pricing on the 99 series is also very good.
I bought a 1197 when the 1198's first came out.....good sale on the 1197....Now, the 1197 won't support accessories like the 360....Wish I had spent the extra on the 1198 at the time.