Another option is to get a tent/tarp (like the SL5) and have John at Bearpaw sew on perimeter netting. Hyperlite Mountain Gear and Mountain Laurel Designs apparently do this as well on their shelters. This works well for me and I can still use all of the shelter space and use a stove without worrying about nest placement (my really buggy trips are not many though). The high mountain lakes seem to get that bloom of really bad bugs just for a couple of weeks after the snows melt.
The water question for floorless shelters comes up a lot. Maybe someone should make a video, so people can visualize this better? After 3 days of going in an out of a tent with a floor and without a good vestibule in freezing rain, everything becomes wet for me. I never have that problem now with a floorless shelter.
Water is not an issue at all for me with the floorless shelter and I usually just bring a piece of Tyvek to lay myself and gear on rather than a bivy sac since I use a Mid type of shelter with perimeter netting. You can divert water where you want it if it is really wet or bring a completely waterproof small piece of floor cut to needed size (Lumber wrap or portion or el cheapo Walmart plastic tarp with the eyelets cut off and put rocks under it on the uphill side edge). Water then runs right under you without being trapped like in a tent...and your tarp doesn't get wet when you walk in and out of the shelter with your boots on. If you do dump water all over your little ground tarp for some reason, then you can just pick it up and shake it out outside.
Instead of ground water, I would be more concerned about not having enough space to move around without bumping into walls that may have significant condensation in really wet, humid weather. I have a Luna 4 (similar footprint size to a Golite SL5, HMG Ultamid 4, or MLD Supermid) and I will probably be going down in size a little now that my son is graduating high school and I will be doing more solo stuff. That sized mid (pyramid) shelter (approx. 110 x 110 inches) is perfect for 2-3 guys with or without gear and 2 guys with gear and a stove in my opinion. I will probably be down sizing to a shelter in the 85"x110" range which would be good as a solo shelter with or without a stove, good for a two person shelter, and probably tight for two guys with a stove. Examples of this size would be a Bearpaw Wilderness Designs Luna 3 or a Hperlite Mountain Gear Ultamid 2.
I have never had a SL3, but from the size and shape, I would think shelters in this range of usable space (MLD Duomid, BPWD Luna 2, etc.) would not be comfortable for 2 guys with hunting gear.