Vitus was considered a "wet noodle" back in the late 80's/early 90's, at least with the guys I knew. A friend had an aluminum frame version that was too small for me, but even then the thing was a flexy flyer. My take would be that frame/fork combo will not ride stiff at all, and I would wonder about the longevity of the frame. Probably ok as long as you're not hammering it in crits, but I don't think I'd like doing 40+ mph down a mountain road on that.
For cruising around though should be fine. I'd go more old school, and I actually prefer barcons to any STI type setup. You should be able to find an 8-speed drivetrain no problem. Find some older wheels (MA-2 if you're really old school, or maybe Open4CD), cork tape on some decent bars and call it good. For old school stuff, this is a good source (or at least used to be):
Lugged Steel Bicycles, Wool Clothing, Leather Saddles & Canvas Bike Bags from Rivendell Bicycle Works