Cant beat owning your own to get really committed to completing the ticket to fly:
First, I bought a hang glider - then learnt to fly it
Then, I bought a Piper Colt (GA a/c) and got a PPL
Then, I bought an Airborne trike and got my RAAus 2-axis licence
Then, I bought my current Jab160 and got my RAAus 3-axis licence..
(My wife says: thank goodness jets are heaps expensive.. ;-)
As well as the motivation from ownership, you save a lot of $$s in having to only pay for an instructors time..
Cheers,