I would buy a known solid regulator at a low price unless I specifically needed a feature. And by feature I don't mean gimmick. I would also totally ignore advice at the LDS.
For example, a sealed chamber is nice for contaminated or cold water diving. If you are regularly diving water below 45F then it's nice to have a reg that can handle that. You may need to route your hose on the left, then the second stage should allow that. The positioning of the ports may be important for doubles hose routing. If you spend lots of time upside down a cracking effort adjustment maybe nice. A metal second stage will help in cold water and with drymouth if you have that problem. I'm sure those with more experience can add to the list.
But I just went through the reviews in the latest issue of Scuba Diving, all 17 of them, and couldn't really find one that I'd really prefer over my MK2+ if you don't have one of these special needs. What the reviews tell you is they all work great at depth, they had to push it to find differences. Simplicity counts for a lot, as does the price.
They liked the Sherwood SR1, FWIW.