I've got the same '94 lavadome, all original stuff at the moment. I've owned & built a few different bikes, and I can honestly say I've been converted to the 'Steel is real' posse by the Lavadome; it's just such a great frame!
I'd totally disagree with highlandsflyer's comment that old kit is always better. That's an odd thing to say of anything, and it doesn't take much riding different bikes to realise that some of the latest kit is incredible, just as some retro kit is still the best.
The Lefty on the Cannondale I had a few years back was a trillion times better than any [retro] fork I've ever ridden, in fact every single component was technically better than on any 90's bike I've owned. But despite the epic ride, it was a bit soulless. I'm going the retro route with my current Lavadome build because I'm purposefully building something that reminds me of my own glory days. So it'll have Girvin Vectors and old HS33s and club roost all over it... it's more about beauty than it is about engineering or sport.
So the answer to your question is it depends on you; that's the cool thing about building your own, if you want it to ride the best then you'll probably want the boring, faceless modern stuff on it because it's lighter and quicker. The exception is the frame; modern fashion being what it is, steel is nowhere and aluminium frames are crazily overengineered/sized and not that light. So as long as you stick with the Lavadome you can't go wrong; there's a reason it's a classic.
