[jome]

I use a 1.5mm elios and it is fine for those temps. Even works for open water diving in warmer water (let's say 25+). I find 3mm too thick for pool, you loose the "feeling" of water, it get's toasty and finding a good balance becomes trickier. The less suit you have, the less buoyancy difference and thus easier to find a good balance.

So my recommendation would be 1.5mm elios suit, can't really go wrong with that. Even a shorty might do...If you need to do static, break out the 5mm again.