I'm pretty sure, but don't quote me on it, with the S you still get the USB. It's in the glovebox, where the SL has it above the gear shift. Also I don't know how much it means to you but the S uses a regular key where the SV and SL have the remote keyless and also has the push button ignition. I love not having to search for my keys and fiddle with the keys in the dark. I just go up to the car and push the little button on the door handle to unlock it. Once inside you just have to push the brake pedal and push the ignition button. It is so convenient, I would spend the extra for that feature alone.
Oh I totally forgot about the intelligent key system! I'm hunting around, there is an SV that has most of what I want for 3k more than the S I can 'live with.' But I have only looked at prices at Carmax, I need to talk to some dealerships and see what they can do.