I have a Lemond Reno road bike that I use for commuting, at least when the weather allows which is not as often as I would like in NH. The rear derailleur (Shimano 105) snapped recently and even though it is supposedly under warranty, Lemod is playing the obviously-been-abused ploy. I'm not here to rant and rave about the ethic of Lemond, the policy of this message board prevents me from adequately describing them.
Now that I need to replace the derailleur I thought it would be a good opportunity to upgrade. Anyone have any suggestions? Is it worth upgrading on this type of bike? If I do upgrade would I need to upgrade the front derailleur (105 triple) as well, or any other components?