+1 on the JLT
I have a JLT True CAI on mine. I like it and it does the job. I think i paid $220 for it about 3 years ago for it new. Only took about 20mins to put in.
I have been driveing my '04 GT for 3 winters now. Your best bet (for next winter) is a set of winter tires that are narrower then your stock ones. You should check out Craigslist, they have a lot of spare rims that you can use for snow tires. I put about 160-200lbs in the trunk to help give...