Pretty much seems like everyone agrees that with 105hp per liter, the NA doesn't have much to gain from traditional bolt on mods.
Forced induction all the way! I did pop a stock block that was supposedly dyno'd at over 350 rwhp. My guess is that it was more like 275-300. I also agree with other that the transmission concerns probably depend on driving style. I have had no problems on my 2nd transmission, but damaged my first slamming gears at the drag strip. The horror! A Lotus at a drag strip!!
To my simple mind a turbo is more efficient than a supercharger, and there is no automatic reason to expect trouble because of the method of forced induction. If you put on a huge turbo that kicks like a mule, maybe it will tend break the rear end loose--I can understand that concern. Turbo technology has gotten so good these days, though. I especially like the twin scroll setups, where you can keep the spool time down and with proper sizing still achieve progressive power delivery.
On major appeal of superchargers for me is that they are easier. Less to choose from, and a more simple install. Seems like the installs can be done by most in their garage and a mail order tune will get you going. Whereas a turbo install can probably still be done in your garage, good luck on the tune.