Stephen,
The reason why your LDS only carries a certain brand(s) and don't wish to pick up a line of drysuits is because of the manufacturer of that line. Some require that the divestore carry quite a few suits, like 6+; this is very cost uneffective for the store, as their overhead goes way up with inventory that may or may not sell. In my area you'd think that drysuits sell like hotcakes, but they don't, and when I walk into a store, rarely do they have a variety of sizes to choose from, if any drysuits on the rack. Odd, but true.
I dive with a Viking. I love the Viking line for comfort, reduced drag (relative to drysuit diving), integrity of the suit (ie it stay dry), and having to use less weight than my last drysuit. I used to dive with a Nokia, which had integrity problems, lots of drag, and had to wear a considerable amount of weight.
If you are going to spend your money, and drysuits are quite an investment, buy one that is going to keep you dry. I have dived with OS, Viking, and Nokia suits. The OS line is cheap, and their "quality" shows. Nokia is no long in the business (yes, they are in the cellphone business). Viking has long standing reputation in the business. DUI is a top of the line suit, and you'll pay dearly for it. Check out the Viking Extreme, their new suit, for about $1000. I've seen the DUI line cost upwards of $2000. Don't forget to figure in thermals for under the suit if you don't already own some. That'll cost you somewhere in the neighborhood of $200-400 depending on what brand you go with. Or, alternatively, you could make your own.