Search the Suspensions thread for the exact settings on the UK alignment. I'm going to try that myself soon. Scott has good advice on avoiding R-compound tires if this is your first season. I'd do the alignment and stick to the street tires for the time being. You do want to add air pressure when at the event though. Probably up to about 38 psi cold. Drop that before you drive home though.
There is so much to autocrossing that your car is not going to be the limiting factor your first year -- your driving skills will be. Spend the first year learning your skills. Spend the $$$ on mods next year.
