I've driven 16 350's + my own of course. Mine is almost 5 years old, a bit lighter than the newer ones and a bit more torquey. I personally prefer my older model in terms of engine. Now if I were in your shoes just getting into it, and thinking of adding quite a few mods, I'd probably go with a slightly older one with low mileage if possible.
But it all comes down to the condition of the car, if you find one that has been looked after both mechanically and panel and paint is in good condition, I'd probably grab it irrespective of year.