Do you think I'm totally fine with the R443 front derailleur and the SL-R440 shifters or would I be better off picking up a mtb front derailleur and some better shifters? I like what I read about the Sugino and I could potentially use some of the left over money from selling the Dura Ace for new shifters/derailleur if you think it might be necessary. Otherwise, I could put it towards something else though I already have new wheels, new rear cassette, new seatpost and seat, new pedals, new headset.

I also understand that I probably should have just purchased a newer and better bike to start with but I had access to all of these parts already so 1. It's pretty much free to do these upgrades and 2. It's a great learning experience for me to do all this work myself so down the road when I do get a nicer bike, I'll already know what I'm doing to a certain extent. Thanks again for all of your help, guys.