I'd go with deurailers. If they break, I can usually fix it in 10 minutes. If need replacing an igh I have to relace a wheel. I'm cheap and I like a crapload of gears, so I want front and rear deurailers. My trek 520 does almost everything I ask of it, so not changing. I may get another set of wheels and mount some 36 or 40 mm more aggressive tread and try some packed dirt and gravel, perhaps studs for the winter. Maybe a dynamo front hub and USB charger. Oh, and retro fit brake shifters. Love how fast I can change gears with barcons and the reliability factor but don't like moving my hands. Also wellco spd pedals. I have a small platform on the one side of my current spds but want something that'll grip my tennies when I'm not clipped in. Oh, and either lower geared cluster or mtb crank haven't decided yet. Again, I'm cheap and just deal.