Seriously, don't buy a touring car just for drifting. You'd be better off getting a savage or another offroad vehicle for the fun factor. Look at it from the sidelines, would you rather be enjoying the hobby with your friends or watching a car slide around a parking lot by yourself?

If you're persistant on drifting, go for the RS4 3 EVO RTR. It has plently of hop-up options ( including the stage-d drift conversion ) and out of the box will be the best bang for your buck, hands down.