normal road cars should run no toe out nor in. On tracks you sometimes run a bit toe out on tight tracks so the inside wheel is turning a tighter radius than the outside.
But i wouldnt bother with toe at all, it wont give you the edge on a street car....only really useful on a pure track car.
My MK1 XR2 which i use as a track day car is lowered a fair amount, the springs are about 190lbs/in front and 200 rear. this makes the rear work a bit harder otherwise it would just be understeering all over the place, but it is skittish if you let off and under braking.
i run about 1.5 neg, maybe even 2, but thats cause its mostly on the track, and tyre wear is very bad. I have had a set of bridgestone road tyres for about a month now and there pretty much half worn out.
you can get a bit more castor is you run the rear lower than the front.....but dont go too over board ot it will affect stability and fast corner handling.
what sort of car are you looking for, safe, neutral or well skittish but fast....cause my XR is a handful on the road.
i have raced the cliocup cars (MK 2s)in asia....abiet only for a short time, but the setup was not radical and the key is not to over complicate matters....simple = good.
lower it till teh track control arms are level (if you run very stiff spirng rates (200+) and just a bit higher if your running softer springs.
sorry for the essay