Winter is around the corner and as per last year I plan to dive all winter. I am currently using a mix of polartec 100 and base layers and a fleece onesie - a real mix of bits and bobs from lomo, go outdoors and Cotswold under a typhoon tri-lam. I would like to get a new undersuit and have been looking at the quark navy at £260, 4th Element Artic for around £200 and the OThree PBB range at £169. Will any of these cover the temp range of about 6c to 18c (perhaps with an additional polartec base layer at the colder end) I am obviously not keen on spending money unnecessarily so the kwark is probably not my first choice ( last time I checked with them last year they were £185 so prices have shot up this year). The OThree is clearly the apparently best value PBB+? Any opinions?