I've been diving a DUI TLS-350 (trilam) suit this year. It's my first Drysuit and although I haven't tried the Neoprene suits, I'd just caution you about the weighting for those suits. The neoprene, with its inherent buoyancy requires you to add more weight to counteract than the trimlams do. The trilams, on the other hand, are more restrictive as they don't stretch at all and wreck divers tend to keep away from them because they are easier to rip than the other materials.
One thing I've learned is that the diving gets much more complicated for a newbie such as me. With the wetsuit, I knew exactly what I was wearing, hood, gloves, 22# lead - the only variables were which color bathing suit underneath and whether I would be cold! With the DS, the ability to change between arbitrary combinations of undergarments makes the weighting plan different. Best suggestion is to log everything you wear and the amount of weight, lowest temperature recorded and how you felt. I do this and refine my weighting and clothing selection for each range of temps. I've only logged around a dozen dives (including training ones and pool dives) with the suit and have used a combination of 4 different sets of undergarments.\
In short, even if you're not a newbie diver, you will feel like one for a while with the drysuit.
Good Luck!