I was actually talking about this keyboard:

The keys not having as much travel is the price you pay, even though I think it's actually pretty nice if you get used to it. It's a bit awkward at first, but I guess faster typing is possible exactly
because the travel isn't that big. You don't have to move up and down as much, therefore, you type faster (in theory that is at least

).
On the construction front I feel it's pretty solid. That has a lot to do with the solid aluminium slab it made out of. The keys are light and of course, plastic, but I fiddled with them a bit trying to pull them loose and I didn't succeed. Personally I feel the build quality feels better than most keyboards out there, even the higher-end ones. That might have to do with my fondness of 'real' materials and in this case aluminium especially, but I do like it. It has a nice, heavy but not too heavy quality feel to it.
You can see the keyboard comes with a numpad. Not sure if they carry this one in a wireless configuration, can't seem to find it just now. At the moment, I don't actually own one of these keyboards, but I work a lot with both the wired numpad keyboard and the short version at college. Pretty much every computer there is a Mac, so you kind of have to

I must say I don't like the short version very much. I don't know why, but I seem to be missing a lot more keys than normally and I hear the same problem from other people. At college they also get a lot of abuse, as you could imagine, but most of then seem to stand up to it pretty well. The keys get a little grubby since they're white, sometimes a corner is a bit banged up due to a major impact but all in all, I can't seem to remember any critically damaged. The worst damage they've sustained are the horrible nametags they glued to them which all fell off, leaving nasty remnants of glue.
Actually I'm pretty sure I'll get one of these for myself. I think that says something, since I can't seem to be friends with any other part of the Macs (like the mice, yugh!); it is worhty enough to enter my carefully selected hardware pool :p
However, please do note that silence of a keyboard is not a big dealbreaker for me and I didn't investigate this extensively. I know they are substantially quieter than normal bigbuttoned keyboards like the one I'm currenty rattling the house up with, but I'm not sure you could call them quiet. I think you should see for yourself. Surely there is an Apple store somewhere in the area where you can go and annoy the staff by going clickety-click for two hours on their fastest rig without buying
I'm just pointing you in this direction, you really should find out if it works for you.
My biggest personal quarrel with it, however, is that it's white and not black. My setup is (and will even more be) all aluminium (real metal aluminium), lot's of black and a bit of shiney bits of other metals. I am currently trying to work out how I can convert one of these puppies to black without compromising on the durability front of it. Guess it'll be a hell of a job, especially the letters/characters, but hey, all in a modders' life. Now that I've imagined it it's hard to shake it.