It may help to tell folks what type of diving you anticipate. Specifically tanks.
There are two general schools/styles of rigs, started or focused around two types of tanks carried.
1) Mexico: best for buoyant or neutral tanks. Lighter harness, mostly straps.
2) Florida: best for handling very negative tanks. More heavy built harness and stiffer structure for supporting the tank weight. A rather defining characteristic is a soft 'plate' over the butt with two 'door handles' sticking up for hanging the tanks off of, and a stiffer spine section. Nomad looks to be of this style.
Two descriptions of the two schools (by the same person):
The Two Schools of Sidemount Diving Heritage
Is Side Mount the new DIR??? Building resentment towards us as a group...
I'd scan the sub forum for school/style discussions. Not that one or the other is best. Just rigs may be better for one or the other. If you have lots of negative from your tanks, as part of your buoyancy or to carry tons of gas, the Mexico style will limit you by not handling that as well. If you're using 2x AL80, you do not need the Florida style, and would clip the tank to the waist anyway so much of the Florida rig stiffness would be just extra bulk.
Another factor is how much gas you plan to carry. Lots and lots of gas means a bigger bubble and more issues on how well your rig handles that. Little gas, small bubble, not an issue at all.
Some rigs seem to straddle the two: xDeep Stealth from the Mexico side, and Hollis Katana from the Florida side.
I'm new to sidemount after doing a lot of reading, so take all the above as maybe - sort of, beyond letting you know there are two general types of rigs.
I have the Stealth and like it, but have only used tiny sidemount tanks: 2x AL40 or 2x LP50. I don't anticipate I'll need more than say 2x LP85/AL80 + 2x AL40, which apparently it should handle just fine. Apparently you can order the Stealth in colors and embroidered from the manufacturer.
Edit: a set of search results:
https://www.scubaboard.com/community/search/37954550/?q=mexico+florida+style&o=date&c[node]=799