I guess I wasn't very clear on my first post. Sorry!

The slope in the top tube doesn't bother me at all, I was just pointing it out so that all the readers would know that putting a shorter fork on the front wouldn't make the top tube run "downhill".

I've already got a threadless fork, headset, stem, and a short reach front brake that I can use. If I use the old fork, I'll have to buy a new headset, brake caliper, and quill stem.

So, I guess my question was more along the lines of: "Will this geometry change really screw with my handling?"