I’m a small business owner specializing in clear bra paint protection film and I’m interested in purchasing a luxury sedan for my company. Its purpose will be to use as a demonstrator and to offer to customers as a loaner vehicle.

I’m looking for something that will be safe, reliable and relatively inexpensive to own/maintain. Interior space is a concern since I am 6’3 and I will be transporting customers in this vehicle. AWD is a requirement since I live in New England and customers will be driving this vehicle. And of course price is a major concern. It must be under $20k. Ideally under $15 for my budget…

Based on my experience I’m looking at:
2009+ A4, A6, or S4 if I can find one I can afford.
2008+ c300 or e350
2008+ 3 or 5 series

I know this is an Audi forum so I’m sure there will be some bias, but based on your experience what do you recommend? Any specific pros or cons for any of these vehicles based on what I need it for? Any other cars I should add to the list?