I have used 3/5 and 7mm suits in those same temps. I swear by the 7mm Elios, as do a few of my northern friends here! If you want long hours in the water then more is better. A 5mm will do in 2C but not for more than an hour, and the point is that by the end your breatholds will be short due to shivering etc.
I say go for it. Later on you can get a 3mm for very deep dives (20 metres+), warmer locales or if you know you will be in for less time.
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