"I'd buy the RS 60 on the floor... "
Do it, you are probably going to have this car for some time and nothing is worse than getting the car you bought home and then wishing for the next five years that you had gotten another car like the RS 60.
The RS 60 has great options list which saves you a lot of money if bought separately, it looks great, is a limited edition, has a few more hp, and has a much better sounding exhaust. In my book, if you can afford it, what's to decide.
Ed