Welcome along.
Have a good look on the forum for a car (in the "For Sale" section), a fair few lovely Eddy's for sale ATM and (generally) when buying from a fellow forum member/enthusiast you know that the car will have been look after and usually maintained above and beyond the requirements.
If your planning on adding more power (torque) then look at getting a DSG car as a manual car may need an uprated clutch, even on Stage 1.
No real issues with buying a high mileage one but make sure it has a full FSH, has had its Cambelt/Waterpump changed at 4 years or 60k miles and has had all the appropriate items regularly changed ie brake fluid, DSG service (if you get a DSG) air con service/re gas etc etc.