I think if they sourced some light weight wheels in 16 or 17" that looked decent people would be happy to pay the little extra. VW uses "aftermarket" wheels (BBS and OZ) all the time and people nearly kill for them.

Also, on the engine/drivetrain, I'd like to see essentially a RSX type S setup (near 200hp with 6spd and LSD). This car could be sold for what they sell the current SI for. Also, use the current SI seats. They are nice IMO.

I voted for the middle option because I wouldn't buy it (it's not a vw and I'm not in the market right now), but I think its a great idea and would sell well.