As I'm sure a lot of you have, I've been lucky enough to get some good seat time in Ferraris - 348, 355 Spider, 360 Spider Fi, 456 and a 550. Personally, I didnt feel much love for the 348 (nearly put it in a ditch within 30 seconds of getting in it!) or the 456 (again, not a good start).
The 355 was great fun, but only drove that for around 2-300 miles. The 360 was epic. Simply loved the sound and the the way the whole car just made you feel. For me though, the 550 was in a different league. I loved the fact that it was so anonymous (how the **** do you spell that?) - I drifted in and out of traffic with no one really noticing, and it drove out of this world. If you wanted to, you could drive it in 3rd gear everywhere - superb engine. Just superb, all around.
I've not driven a 575 but if the numbers came in, I'd be getting a 575 F1 over just about anything else. Of course, the GS comes first.
The above is what lead me to the GS - I reckon its as close as you can get to a 4 seater 575 F1, with added rarity and anonymity. What could be better?