Bike Forums - Upgrade or not?

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Oky Doky.. heres the low down.

Im getting a 1994 Giant road/race bike to add to the stable for my backup commuter.
Am building a set of wheels from a sora rear/ultegra front hubs to slap on her. The rest of the bike has all the org componets...so the question is should I upgrade or leave it as is?
Only problem with org stuff is left side down tube shifter.. the little plastic pice that looks like a washer around the screw that holds it on??Is broken.. it still works fine ..but i know its broke and it bothers me...I like to have my stuff 100% and cant find a replacement part for the shifter..so should I upgrade or keep looking??

Advice.. suggestions?? What would you do? :D

Is it 6 speed indexed or 7 speed? I'm sure you could pick up some NOS or slightly used decent replacement shifters on ebay.

http://cgi.ebay.com/BRAND-NEW-SHIMAN...QQcmdZViewItem

http://cgi.ebay.com/Shimano-600-SIS-...QQcmdZViewItem

http://cgi.ebay.com/Shimano-105-7-sp...QQcmdZViewItem

7 speed and yes found a set thanks a million :)
7.99 a set too woo hoo!

ok still...upgrade or leave it el -natural?

leave as-is if all works well and you can get a cassette for your new wheels

Thanks junkdad , my thought's too.. but wanted a 2 or 3rd oppinion.