You are probably more likely to get more back from your investment if you went down the FI route than if you bought a type rating. Instructors are not as plentiful as they used to be since the self-improver route has gone under JAA. The days of spending years as a FI are gone and nowadays it is months! The instructing side is not a 'career' move since it simply can't pay the bills. Look at it as an apprenticeship!