imo all depends on funds big turb conversion is at least £1500-3k depending on setup... getting around 300bhp out of a small turbo is much easier but as you know you are limited i have my autronic ecu so i have saved half the battle and cost, hence it shall only cost me around £1500 to be fitted and mapped with all new bits and bobs too.....

think this is something you can only decide yourself...