4 or 5-speed? And wich one??

[tdc911]

I am busy building my beetle project. My goal is to mount a type 4 2400cc engine with 200 PK. I don't know wich is the best solution for the transmission... Should I stay with a 4-speed gearbow or mount a 5-speed gearbox. I'd prefer to mount a 5-speed one butt wich one? One from a porsche 911 or 914 or a vw 4-speed one converted to a 5-speed box.

Friendly regards,

Tom