Join Date: Feb 2005
Bikes: Trek 5500, Colnago C-50
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The shifters, cassette, and chain need to match, all 9-speed or 10-speed. 10-speed would be preferable because replacement parts will be around much longer and the extra cog is nice. The old crankset/chainring set may work fine, at least if they are in good condition they would be worth a try. I don't believe the 6-speed D-A rear derailleur will work because of the throw ratio.
9-speed and 10-speed cassettes will fit 8, 9, and 10-speed Shimano compatible rear hubs. You will need a new rear hub. Depending on the value and condition of the old wheel rims and spokes you may want to rebuild both wheels with new rims and new spokes, or you could just rebuild the rear wheel with a new hub. The steel frame can be spread to accept the new hub with 130mm dropout spacing.
I don't know how important it is to you to convert to STI. If the old components are in good condition I would probably clean and lubricate all of the bearings and ride it as is.