You could use your vacactions to work yourself on the Porsche, and you will save on the maintenance bills
...Otherwise, Las Vegas
...or, if you want to bump up your salary, working more or negociating will only give a linear increase, within a usually predetermined range. If you are already at the top of the range, and not paid at the comission, there is little room for more. Unfortunately, the degree seems to be more significant to the salary than the performance. For instance, a bad phD will usually make more than a good engineer...so, if you want a quantum jump in salary, I would recommend getting a higher degree. First thing is to honestly assess if you are underpaid or overpaid for what you are doing.
Aurel