Im looking to pick up a new set of Bridgestone Blizzaks for the coming winter season...would this size be fine for my stock wheels?

Blizzak LM-25V 245/45/18

 

The Lexus dealer near me was recommending Bridgestone LM60 Blizzaks for the winter and I think the specs were 235/50R18 101H with load rating XL. When I get my 2011 LS460 AWD/SWB later this year my plan is to use the OEM wheels with the winter tires and get a set of Teleios rims with OEM tires for the summer.

This is for use in the Toronto winter climate; not as much snow as Buffalo or Chicago but more than most winters in Vancouver.

 

personally.. i would stay in the OEM size..
ideally, you don't want to go WIDER in the winter.. which you are trying to do.