Parking: For me the bus is around 10 minutes slower each way. I just take that most days.
Home parking: Free on-street parking
Gas: $40/month * 12 = $480
Registration: $200 (May be a bit higher now with ST3)
Insurance: $700
Maintenance: $1000 sounds about right
For around $2380 / year. Well worth it for the freedom it gives me imo.