My absolute faves are the Michelin Pilot Sport Cup - brilliant grip levels in the dry, decent life and great grip retention once they're up to temp. On the con side, they are a bit dearer than other brands, they take a little time to warm up (usually a couple of 8/10ths laps - meaning the first timed lap of your sprint sessions mightn't be full pace) and they're very average in the wet.

Am currently running the R888s on the Polo as I can't get the Michelins in the right size - they're a pretty good tyre as well and give great grip, but I've found they tend to go off pretty quickly (after 2-3 track days they get quite hard and lose their grip).

I've also run with the Kumho V70A (medium compound) which had similar grip to the Toyos but lasted a fair bit longer. I've had trouble getting these in 17" sizes for the Polo lately hence my switch to the Toyos.

Stay well away from Falkens - tried those once on the recommendation of the local tyre place when the Kumhos were on back order, and the only thing they were good for was motorkhana events where a combination of handbrake turns and first gear corners without ESP converted them into smoke as quickly as possible.