IMO Big turbo everytime but if you aint fussed bout big power get small turbo (engine looks better IMO anyway!) car will be newer and your more likely to find a good un, BUT every1 I know who has a small turbo got bored of the power and has either sold to get big turbo or converted to L8 ecu etc (not cheap!). Maybe your best best is to look at both versions as good uns are hard to find, this way you wont miss out. Happy hunting.