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I have the stock DSM FWD Turbo tranny, I would love to have a taller 5th in it, just to get the buzz down.
A lot of people swear by using the F5M33 trans, but I am a big believer in the KM210. Having a lower RPM on the freeway doesn't necessarily mean you will automatically get better mileage. Mine went from like 3,100rpm at 70mph in the KM210 down to like 2,500rpm with the F5M33 + AWD 5th gear. This put me way out of my powerband for cruising, and I found that I had to lug the engine way more to pass people and pull up hills, and a lot of times I'd have to change down to 4th gear. It definitely will put the RPM's below that annoying resonance point that all DSM's typically cruise at on the freeway though.