For those of you that have upgraded your 80's Allez with modern components and wheels, do you feel that it was worthwhile? My Allez is still using the original Dura Ace components and while I love the downtube shifters and their direct feel, it would be nice to have more than 12 gears and lighter wheels. I have a set of DA7900 derailleurs and crankset that I'd love to throw on it but I also love it the way it is with everything being as classic as possible. Thoughts and opinions?