Just be aware that disc tabs put a fair bit of force on the fork blade which the pomp fork wouldn't have been designed for. I'm sure it's stout and might be fine, but it would suck if the disk ripped the front of one blade off while going down a hill! When I was thinking of doing the same thing Dave Yates advised me strongly against it and I trust his opintion.
I bought a nashbar carbon disc form from the states for my cross check which does the job – it's the same as the much more expensive winwood you can buy over here. Only thing is that they wanted a ridculous amount of money for international postage so had to get a mate to bring it back. If I was you I'd buy Sam's fork.
Unless you are getting hydraulic brakes, I would say don't bother. I spent a lot of time and effort building up a drop bar road rat and it is very heavy and rather dissapointing. The total is less than the sum of the parts and the BB7 brakes are more trouble than they are worth.
My experience of putting a road BB7 on the front of my crosscheck was very different. Excellent braking and very easy to keep the BB7 working well.