I've been playing a game called UFO: Afterlight, which is very good (sorta like squad-based TBS, but uses a superior (IMO) system called SAS - which is sorta like real time but everything your units do takes time, like in TBS, you can pause anytime you like with full control, and you can play the game in ultra slow motion for perfect control over tactical battles. So you get the same effect as TBS but it all resolves in real time and you can easily change a solders orders (or plan - series of orders) as situations demand. It has an excellent global/strategic layer too. Cool base management, research, production, and expansion design.
UFO: Afterlight is somewhat like the good old X-COM games, and a lot of old X-COM players play it. Some people even get confused and think they're the same series.
Aftershock, the previous "UFO" game, was good, but buggy and it had performance issues - Afterlight is vastly superior.
I thought Silent Storm was ok - it was fun to play for lack of any other squad based tactical TBS types of options (til I found Aftershock). The incredibly poor AI in Silent Storm and the time it takes for AI to do anything on it's turn makes SS tedious to me. I still had a lot of fun with it for a long time. The interesting character development, missions, and rich WWII flavor help lessen the impact of the utterly horrible AI.
I love squad-based tactical games like X-COM, Silent Storm, and the UFO series. I wish more companies would develop quality titles in the genre. (I never cared for the commando series - too rigid for me).
Another good TBS game that people might've missed, and that's not a squad-based tactical, is a game called "Shattered Union" - reminds me of the old "Fortress America" board game sorta - but on steroids. USA is split into different factions and you have to take over the country, with an army of modern forces you build up with funds you get for controlling territory. The focus is on the battles (ie, outside of your budget there isn't much else going on when you're not fighting in a territory).
And of course, I've been playing GC2:DA, but I'm taking a break while enjoying Afterlight, and sorta holding off on more DA til there's a patch. DA is plenty playable, but some of the bugs I've encountered are irritating enough drop DA down the priority list for now. :-/