The guys are right in some ways, it isn't really a track car, although the V8 Vantage performs very well on track & is reliable enough to use, but you would feel guilty! If it is a track car I'd go 996gt3 after your CSL or a 997GT3 if that's within budget.
I have the new 4.7 litre Vantage V8 & it is an awesome car, more grunt & character than the CSL, you will enjoy the car as much for the design. looks & interior as being a great drivers car & that V8 engine note is to die for!
So my call would be:
If you want a very special car for the weekend & the very occasional track day a V8 Vantage Roadster.
http://www.rennteam.com/showflat.php?Cat=0&Number=478859&an=0&page=1#478859
For hardcore track work & weekend B road blasting.. GT3!
Or get a Nissan like everyone else!!!!!!!!