+1

Go for all 3! Git 'er done and be ridin'! That's a really nice frameset so I think its worth the upgrade. I used to have the stem conversion thing on an older Lemond Malliot Jaune steel frameset. It worked a-ok for me before I broke the seat tube above the bottom bracket and had to replace it.

Edit: You could also sell the older Campy Super Record parts to recoup some cost.