That's a pretty tidy Impreza, Gareth, however be careful. The 4-door is not as practical as you think, and if that's an STI, I have a feeling the rear seats don't even fold down. It will also cost you a bank loan to run...heavy on fuel, tyres, brakes, servicing, parts costs, you name it. Our 5-door MY99 was a cracker and I do wish we still had it now - it DID have the practicality to be a baby-wagon, but even on our dual salaries it was becoming a drain to run it and enjoy it day to day.
A strong Turbo Diesel is what you want. There are some nice Audis knocking around with 130, 155, and 180 bhp TDi on tap (and as much torque as a standard Impreza Turbo...chippable if you REALLY want more!). Double the mpg of the Impreza, half the servicing costs and way better residuals.
Think carefully before acting
Campbell