You may get to try them sooner than you think Miles...
Those are the ones I'm getting for this season. $161/ea shipped from Discount Tire Direct. They almost look like Kumho MXs. I chose those instead of Victoracers because I'll most likely drive them to events a good part of the season. They're even ok in the rain as long as they aren't shot.
The only person I know who has run them on a C4 loves them. He runs mainly track. He said they don't chunk up like Kumho does. Rocks/pebbles don't stick to them really bad unless he does burn outs. He drives to the track with them. He does autocross from time to time. He felt you probably need a couple of passes or really warm day to get them to heat up but wasn't dissapointed even when they were cold on his first pass.
Seems like a good compromise for price and being able to drive to the track even in the rain. We'll see...
Now if I kick your .... in AS of course it's the driver but if I don't then it's the tires
Graham