Since you want a daily driver, go for the newest car you can afford. A C7 edition would be awesome if your budget permits. Thery are already planning great changes for 2015 with the performance data recorder and the top dog Z06 coming out.
However if your bufget is limited, the C6 and C5 generations are great cars.
My 07 vert has served ne very well for the last 7+ years.
Hope this helps and Good luck.
PS: I would stongly suggest you have a mechanic go over any used vette before you buy as repairs can be pricey!!!!!