What fatty said, rule of 72 is a killer getting out of novated leases, plus FBT can be a cunt, you will need to do 25K Kms per year to minimise.
Having said all this I Novated 2 subies with good results, mainly because residual value on car was way below replacement cost ie my 06sti cost me 20K pay out and real worth then was prolly 35-40K.

I would be more inclined to look at property as effective tax minimisation in your case.

Al

PS AMD should be able to give some good advise in this area also