It's a tough call. I have been lucky enough to have my Mustang and a wide range of other cool cars. One of my favorites was my C6. I really enjoyed that car. Drove it daily and it was a blast.
When it is all said and done though I wanted to mod the shit out of it. But I already have a money pit and now that I am a little older I am content with what I have. I am a true gear head at heart, but I have spent a small fortune going through cars.
Like others have said, if you are content to have one toy then go for it. But if you are going to start building the next one like crazy you should stick with what you have. Much easier on the wallet.