If I were you I would probably look for a set of steel 15's as those will have more choices available for tires and would probably weigh less (don't quote me on that part, but I think there's a sticky somewhere in Wheels/Tires with the weight of these). The sizes the Focus uses for 16s are kinda uncommon. I've seen people using Falken Azenis RT-615 on 15's which make a good street/track tire. They are more popular for Street Tire class though since Stock class can use R comps. There's a new Bridgestone Street/Track tire called the RE-01 that is supposed to be excellent.
Yes, that is a banana in my pocket.
Dan - gump
[BBS][Borla][Focus Central][Hella][K&N][Koni][Lentech][Wings West]
Wiregrass Region SCCA