To augment my prior comment (on the releaf zipper), with any drysuit most of the cost of that suit is likely with the zipper. In fact, the zipper is pretty much the key component to all drysuits - when they fail, the suit doesn't do you much good. Proper care and feeding (waxing) of your zipper is an absolute must - to protect your investment.
Having said that, most conclude that adding a second zipper (releaf) to a dry suit is just asking for more trouble. Maybe so. The releaf zipper won't help you much under water. Having a back zipper and no releaf zipper doesn't help you out of the water either - if nobody's there to assist. I find what I love most about the releaf zipper is that when I just get out of the water and am taking off my gear, I can "burp" the suit by opening the releaf zipper and getting some freash cool air flowing right away. I may opt to add a p-valve anyway (for those underwater comforts) and feel the releaf zipper could help with those last minute attachements (hose/catheter), too.
I forgot to mention pockets. The XCD2 comes with one pocket, which is pretty streamlined. You may want to opt for a second pocket (one for each side) and can also opt for a larger (cargo) pocket if you'd like. Otherwise, they're only good for holding small things during or between dives.
Bare also offers their cuff rings. These make for quick changes of (latex) seals, which can be handy, or allow for the use of their dry gloves. With the dry gloves, the wrist seal stays in place, so cutting/ripping a finger doesn't result in suit flooding. That's the good part. Not sure how these compare with the DUI zip rings, since I've never tried one. When diving warmer water, or when using standard wetsuit type gloves, the cuff rings can be a pain to deal with (you have to find a really short glove length without the velcro cuff wrap) when trying to stuff that extra cuff up under the ring. Between dives, those rings can bang against your hands and cause some pain, too. So if you plan to dive a lot of really cold water, or plan to get in and out of the suit frequently (wearing out the wrist seals) then the rings may be useful. Otherwise, be aware that they can be a literal pain in the wrist.
