First of all,
HERE are all the tariffs.
Second: SMS with Wind Senza Scatto are 0.12 to any number in Italy or the World. Wind has also other offers with set-up fee which are better than the other operators, plus the "Wind6SMS" option with SMS at 0.06€.
Third: MTV Mobile packages are sold at TIM shops and they use TIM top-ups. There's no sim-only package, i.e. you have to buy a phone, making it surely more expensive than the competitors if you already have a phone.
Fourth: except Wind, all other operators have surcharges for SMS sent to non-Italian numbers, remember it.