Get yourself over to s2ki uk If your not ther already.
Turbo can be cheaper thers a few bolt on kits that go cheap in the us.
Id say supercharge works out more. But you will find alot of people in the states always end up going turbo from supercharge.
This still possible with the turbo route, you can use a quick spool turbo and still get upto 400hp. With the 6262 which is really big, give 330lbs torque by 4000rpm. And for me turbocharge is more drivable and usable, you can control the boost how you like in the gears and with this specific setup fuel economy is better then before. Something you wouldn't be able to do the supercharge route.