Links to Dry Suit makers that may be of interest if you are considering purchase:
http://www.kokatat.com/ Goretex® and non breathing dry suits
http://www.ravenspring.co.uk/system/index.html Economical source of drysuits and other technical clothing.
http://www.trident-uk.com/ Good and relatively inexpensive (£200) drysuits in Gateshead, NE England - also do a good repair service for their own and other makes.
http://www.chillcheater.com/products/shop.asp Reed Chillcheater is a tough stretchy material - neck seals in particular last a lot longer than latex, but if you have a big head (or a small neck) they can be quite a struggle.
Drysuit gaskets are typically a latex rubber seal that fit tightly around your neck, wrists and ankles. Some drysuits come with integrated GoreTex or latex bootie?s so an ankle seal is unnecessary. Full drysuit feet need care not to puncture them when getting changed, and have the one disadvantage that if you do get water inside your suit, you can't stick a finger up the ankle seal to let it out. Sunscreen, insect repellents, lotions, high heat and humidity, extreme dryness, and exhaust fumes from cars or gas appliances can destroy or shorten the life of gaskets.
Occasionally, [drysuit gasket]?s may be too tight. Latex gaskets are intended to fit snug; they will stretch a little with use. If they are too tight, [gasket trimming]? can alleviate this. Stretching a gasket over a form creates microscopic tears, and can shorten the gasket's life.
Gaskets typically need gasket replacement every season or every other season. Protect gaskets from UV degradation with UV protectant occasionally.
If you have latex booties on your drysuit, you'll find it difficult to slide your feet into or out of your footwear, since the latex is sticky. Get a thin pair of liner socks, polypro or nylon, and cover the latex bootie with them. They'll then slide in and out easily.