Those were the 2 I was going to mention. I have the Atlan and it's been a good suit.
To the OP.....
Be clear on what you are asking about. A neoprene drysuit such as DA mentioned is a suit made of full body wetsuit material. They are very warm suits for shallow water diving however you may need to wear more weight. As you dive deeper the neoprene will crush resulting in less insulation and a loss of buoyancy that you need to compensate for. The nylon/neoprene/nylon is not what people are speaking if when you read about a tri-lam suit. You can get into these for well under $1000.
A tri-laminate suit is made with a sheet of butyl rubber with a fabric facing on each side. These suits offer virtually zero for thermal protection and do not stretch. They are cut large for freedom of movement and you wear what amounts to a high performance snow suit underneath. The properties of the suit remain constant and injected air lets you control the loft hence warmth of the under garment. These are the more expensive suits.
What sort of diving do you plan to do?
Pete