I have rented for the last 20 years from Hertz on St Maarten and even though it has an "Corporate" name it is owned and operated locally and has given me both a great competitive price and service. Other than your statement "worry about $20 to $50 a week on what car then rent regardless of the service and issues associated" I don't agree with avoiding " the corporate name places like Hertz, Sixt, or the others" because of this.