Hello!
Well, I say if the water is cold enough for a wetsuit... then it's cold enough for sleeves on the wetsuit. That's just me. I HATE COLD WATER.
As far as wetsuits go... it's all about fit. Someone can tell you that Zoot makes a great wetsuit, but if you can't fit into it properly, then forget it.
Otherwise, I bought and tried out like 4 different brands. I have to say the Desoto 2-pieces impressed me the LEAST. So many people love them, but compared to the other ones I had tried, it was the worst material wise.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"