Hi!
I own a Lexus IS200 (same as IS300 except the engine).
I have Bridgestone Blizzak 22 or such on it, 215/45 R17.
Really good stuff.
But also those tires slip as sh.t on fresh flown snow, because it doesn't stick on the ground and the IS is very light on the rear axle, so your wheels will spin as hell.
I noticed that they stick better when the snow just lays some while and got hard in cause of other cars.
But anyway..... get some Blizzak and you will feel a difference. B)
N-Ice greetings,
RoadRash