I'm using the silent ([EDIT: I had this in reverse..] cherry mx brown; non silent is cherry mx blue) DAS keyboard. The "professional" model has the letters on the keys, if you don't want a blank one. They seem to come in both US (wide enter) and UK (tall enter) versions. I personally chose the UK one as that's what I'm used to.
Here is a photo of my keyboard. The coloured keys are sold as WASD/escape keys but I used them for playing Skyrim - the green one on the right is especially handy for gaming as i don't have my fingers on the home row when playing games rather than typing. The blurred circuit board is a development version of the Midifighter 3D as the photo was taken before they were announced.
I also have a Das keyboard and it is really awesome. (Also, I think it's the best looking keyboard I have ever seen--very minimalist.) However, I think you have them backwards--the "silent" version has the brown switches and the normal version has the blue switches. I also have the ultimate silent version and it is not really silent--it's just quieter than the other version. You still get a satisfying noise when you use it.
I've been really satisfied with it, and would definitely recommend it to anybody looking for a nice mechanical keyboard.
You are of course right! I have a brown, not a blue! Not sure why I was thinking about it in reverse - oops.
Well, mine is quieter than other keyboards I've used, eg a Dell keyboard as long as you don't bottom the keys out, though I do get the occasional loudish click when the keys snap back, usually from the space bar, though if I slow down when typing I can make it almost completely silent (obviously thats not normal typing though).
 I did have a Saitek eclipse a few years ago that was quieter.
It did cost a lot, but honestly, as a programmer I type so much, its totally worth investing in a good keyboard and I love my DAS keyboard.
The only thing I wish is that the keys were in a flat grid rather than staggered, but it seems very very hard to find any keyboard like that, so no biggy. I've considered getting a Kinesis for years now too, but since I got the DAS, I've had no plans of switching any time soon.
I haven't completely worked out my vim bindings since I've been doing a lot of Qt development in QtCreator lately and just used that without vi mode. I use Colemak for my layout so some of the default keys are a little less than optimal, but I also don't want to change them too much. With one or two simple key swaps it seems quite usable though.
On windows (where I don't use vim) I did map alt-gr to some common programmer symbols; mapped caps lock to control and control to backspace. On my laptop I use vanilla colemak though (including caps lock as backspace, though I'm likely going to change that some time).
I bought a das keyboard last year for home. I got the blank keyboard, but found that a lot of random hand issues went away. I ended up buying myself a second one for work, and will absolutely not go back to a standard keyboard.