I have no issues with the interior space... but I'm only 6'. The interior is designed nicely and cleanly...if a little sparse. I, personally, love the placement of the seat heater switches on my '05.
The stock suspension was TOO soft, IMHO. I dropped the car 1 inch to help reduce roll and pitch.
The step up from stock to Stage 2 is a huge change (13 psi to 18 psi boost pressure). Also... I have driven both the 5EAT and the 5MT (which mine is) and the 5MT is MUCH more fun to drive IMHO.
The I drive is a joke. I wouldn't want that on mine... what a PITA.