Hi Bradley
I've literally just done the same, purchased an A4 cab, 03 model. Looked at many TT's too but to be honest felt they were a tad small. The A4 is perfect, mine has just 49k on the clock, 1 owner from new and fsh and reading through the service book the cambelt was changed just 8000 miles ago on mine. Have to say I had a 66 plate company car until just recently and this A4 drives and feels as tight and as new as my company car did. So my suggestion would be to find a low mileage model where possible, there are plenty out there, and get one with service history. Then enjoy because with the roof down they are brilliant!
Cheers
Wayne