Pete,
You would be mad to sell it at the moment mate.
You, and particularly you in that car, have proven to be absolutely on it this year and have been progressing tons all the time. I think you should persevere with it and be an individual. Its not like Nicks statement of starting from an inferior level of car either - it absolutely rocks !!!
Just my 2p pal,
J.
PS Im sticking with my turbo for the time being as I have spent rather alot of money on the rest of the engine - oh and 2 new cars this month !!!
J.