Driving makes me thirsty too. Life's too short to not enjoy an ice-cold Coke (water or Java if you desire) with my car - two of my favorite things. It's May in Georgia and it's already hot & humid. I searched eBay and other sites for suitable cup holders - something lightweight and complimentary to the interior of the car.
www.drinkholders.com has the only horizontal-mount collapsible drink holder that I could find. Vertical mount holders are available often through marine or auto suppliers.
I think it will mount neatly on the wide door sills and collapse small enough to get out of the way. Plus it will be in a more ergonomic location than the floor by the shifter.
The cup holders come covered in leather or burled walnut finish, but I contacted the company and they also do an Aluminum Finish that I think will look best. (I was leary about trying to match the "biscuit" color leather in my car and thought it would look too cheesy.)
I'll post a photo when I get them installed. I am considering installing them with velcro so that they can be removed if need be.