car running rough - got an estimate of $1300 - Is this too much - description below on 2005 Mini Cooper

Car needs new seal, new valves, new value seat, new thermostate, and an oil change - Is $1300 too much?

Asked by for the 2005 Mini Cooper
Get a second opinion before going any further. Keep in mind, Mini is a product of BMW, and repair and maintenance costs will be high compared to a domestic vehicle.
Thank you