Its so subtle normal people wouldnt even notice it. Even GTV people would probably miss it if it wasnt pointed out to them. Really I think the GTV is better without the big spoiler.
After owning cars with and without the spoiler all I see now when I see my car is this apphendege that is stuck on the back of it which needs to be removed.
In terms of saving up to get a V6 I did the same changing over from TS to V6. My change over cost overall was only $1,500 (700 GBP) which is almost nothing compared to what you get. Considering V6s in Australia are about $17,000 or (8500 GBP) and Im sure you can get V6s for about the same price of a TS if you bought a higher mileage model or savvy in negotiating a deal.