Have you ever thought of getting a 6 speed transmission from the latest models?
I heard it's pretty much a straight fit, you only have to replace that and the driver's side semiaxle(also clutch and flywheel if you wanna do a proper job tho).
Should be quite great especially for long trips where you can just get the 6th in and chill.
Diegorborges about my Valo fix: "Now all of you must have your slrr folder like this: C:/BIGBOSSisMYlordANDiamHISbitch/SLRR LOL"