Interesting to see this thread resurface just when I'm going through this series again myself

.
I'm shocked to see that so many of you were suggesting Sure Fire Win rides on this one - surely the point is to make this as challenging as you can? That's where the fun lies after all. DA's suggestion of the Zonda is a good one. That's is a fine handling car, if you fettle it right and has the virtue of not being one of the Big Three or an F1 (shame on you people for suggesting such a thing

).
I'm nearing the end of a 100%/100% run through the game and I'm trying this series this time with the Jaguar XJ220 Race Car and have made it through Race 6 (Rome) to date.
Apart from the Test Track (Yeuk) and Midfield Reverse (where the AI are unfeasibly fast) at which I ran her fully Stage 4 Turbo'd, I running a Stage 2 Turbo and having a gloriously competative time of it.
The field I'm in only has the 787B to really worry about, which is lucky (I have seen all three of the Fast Slabs in here before

!) but the MOV is shrinking as the AI get higher and higher power upgrades and my HP trails downwards.
The first few races I ran a T3/T5 tyre mix so that I had to pit and make it more difficult but now I'm finding I have to go the T2 route and just drive as cleanly and consistently as I can to take the flag.
It's getting quite hard now - my MOV at Rome was only six seconds

. I'm hoping I won't have to go for the Turbo 4 on the later races but we shall see ...
Anyhow, the basic point I'm rambling towards is that the series is
much more fun if you're not simply using a 'game superior' (not to be confused with 'Real Life' superior) car to take victory. If it's your first time, then the GT-ONE or the R390 are okay but racing in the GT3 environment can be so much more with supposedly inferior hardware if you take the risk.