The one i am using is similar, its a Momentus 5400.3 160Gb. So i guess that will work, battery life wont be the same, but if that doesnt bother you then go for it.
Thanks. I find the proclaimed 10 hour battery life to be a cruel joke. I was lucky to get half that with my N1. The N2 is a bit better but nowhere near 10 hours. Still, I mostly use it in the truck with the car charger or when I'm out walking so I keep it topped up.
How much did you find that the 160 GB reduced the battery life?