I think of the available pitchers ( I don't want to deal with Oakland, that would be giving up too much in return ), I think the Garcia has the best stuff, and could turn into an ace very quickly. He's only 27, and like I said, has some very good stuff.
I don't want to have to give up the farm, unless it's for an awesome, awesome pitcher (The only pitcher I can think of that might be available that I'd want is Halladay). Garcia would sort of be a dump for Seattle, if the Sox would only have to give up Lee to get Garcia, I'd do that in a heartbeat.