I'm a single wall tent person--I'd rather have a more open and airy tent and avoid claustrophobia. Before I bought my first Tarptent, I had a Sierra Designs tent which dripped condensation-big puddles of it--from the inside of the fly into the inner tent--I had a lot more condensation issues with that tent than with any single wall tent since. At least on a single wall tent, I can reach the condensation and wipe it off! However, that's not what you're looking for.
If I were looking for a two person double-wall, I'd definitely get Tarptent's new Stratospire 2 or (if really stormy weather is an issue) their Scarp 2. With both tents, the fly sets up first with the inner tent clipped underneath, thus avoiding the problem with most American tents of trying to set up or take down the tent in the rain without getting the inner tent sopping wet. The Stratospire will let you set up the inner net tent alone for starry summer nights, too!
I have used tents with trekking poles since 2005. If you are going to base camp and dayhike, there are several options. You can find appropriate length stick/sticks to prop up the tent while you're day hiking with your trekking poles. This may take longer than you think! You can buy the extra poles sold for those who don't use trekking poles and ignore the few ounces extra weight. You can remove the trekking poles for your day hike, drape the tent over your gear so no water will leak inside and use rocks or smooth logs to hold it down. (Be sure all your food/smellables are hung or in your bear canister while you're gone!) I have used all three options, depending on circumstances, although I gave up the stick option after trying it once. It might work fine if you're not camped in a popular area where most down and dead wood has already been used up.
Silnylon, although it looks fragile, is actually stronger than a lot of polyurethane coated nylons. The main disadvantage of silnylon is the slippery floor. You'll have to paint silicone spots or stripes on the tent floor and stripes on the bottom of your sleeping pad if you don't want the pad going one direction and you another every time you turn over.
There are a number of options in which you can buy a tarp/fly and inner net tent separately, creating a double wall tent. Some of the vendors offering this option are Mountain Laurel Designs, Six Moon Designs and several others--since I'm away from home I don't have access to the list. Most of these options are a bit more expensive, though.
With Tarptent designs, you can very easily reach out and tighten the guylines from inside the tent. You usually need to do this when you go to bed --the tent will have loosened up due to the drop in temperature and the onset of dew. Normally there's very little more stretching of the fabric even if it pours during the night. For me, it's a non-issue. Some like to use elastic cord for part of the guylines to avoid any adjustment, but I haven't tried it so can't comment.