Quarzac, forTruce, I'm not sure if you're professionals or students, but in either case, if you spend a lot of time on the keyboard, just think of it in terms of dollars per hour. For me, so far, I think I'm in the pennies per hour range, or at most nickels. I bought mine in October last year. I mostly only use it when I'm mobile, but I've probably logged nearly 1000 hours on it, at least. When I use it, it tends to be for 6-8 hours per day.
If you like the layout, you can convert the Model M to that, as well. All of mine are.