Hmm ... 20+ mile commute to work. No public transportation available. Cab fare would be about $50 each way.
$100 for every work day. For weekends, I usually go with my GF out of town or at the very least, shopping or to visit family. If she could still have her car then we'd be ok, but otherwise, We'd need at least $200 for every weekend day. Then, due to time lost waiting for cabs, etc, and all the inconveniences that come along with it, I'd want at least $1K per month on top of that.
So, If somebody gave me 5K per month, I would be OK with not having a car.