I've got a cross bike that I want to make a little more tourable. I'm going to switch the double to a triple and get a 11-32 rear cassette. The problem is that I'm getting a little confused about what derailleurs I need to get. Right now the bike is all Tiagra stuff, STI with the brake/shifter combo. Shimano has a triple taigra front der but the crankset I'm going to get is 46-36-26 and sheldon brown warns against using a front der with a big ring that is a lot smaller than what its designed for. I'm also not sure if the rear tiagra der can handle the 11-32 cassette with a triple up front.
anyone done this before who has ideas for me? I e-mailed Sheldon Brown but haven't gotten a response in a few days. I figure he's buisy but I thought I'd post here just to get a few more opinions.

thanks
tim