I have the original classic version 1 and I'm thinking of upgrading. Should I go for the 4 regular or 5 regular as there isn't much difference between the 2 except battery and of course price.
To what @LiquidSnake has already said, I would recommend also visiting one of the stores and to try out the models yourself. This will give you an idea as to what fits/looks better. Feature wise, they are more or less the same, except for larger battery, different materials used and presence or absence of a bezel (applicable only for classic vs pro) and the cost of course!