Oh -- regarding the stem, I'd probably wait on that and see if you can find a saddle you like (though an adjustable stem is certainly less expensive than a nice saddle!). If you can find a saddle that lets your body rotate forward without numbness, your hands may be more comfortable as well (negating the need for a different stem). I also highly recommend bar ends. Some like them on the outside (I do...as pictured on my Giant Roam a few posts up) and some like them inboard of the brake levers, so they're more inline with traditional drop bar width (38-42cm). Regardless of how they're mounted, bar ends let your hands get into a different position that is generally more comfortable than typical "flat bar" geometry. One of the worst designs (for me) in terms of long term comfort is a typical flat bar (regardless of round grips, Ergon grips, etc.). I really need a little more backsweep that most of those bars provides if I'm going to hold the main bar -- but bar ends lets my wrists get into different positions that support more comfort.