Props to you Wigout for going into this armed with all the information.
I own a rather lovely R34 GT-R (and I also have a wife, a mortgage and three kids at private school), but I would've owned it probably 5 years earlier than what I did if I had used all the money I tipped into my RX-2 (around $30K, not including a couple of personal loans along the way) and had gone and bought a house instead.
Sure property is looking shaky as a short term investment at the moment, but it won't keep going down forever, either will shares if you prefer to take a bigger risk. In fact now is probably almost the perfect time to buy either. I'm with Marlin, use your 50K as a deposit on a house, you'll end up a long way in front in the long term. Smart investors know that it's not just about having money, it's about using it to its full potential - that usually involves maintaining a 'healthy' level of debt.
Added: get yourself a financial adviser and explain to them what your goals are, then you can map out a course that will use your money more effectively and still allow you to get your GT-R