I'll just list my favorite add-ons.
Aerosoft's Beaver. A great rugged STOL that I can fly to just about any airfield. And Cape Kennedy. I gotta have my NASA stuff
Carenado's T-34. I just really like it and I also have a alot of their other planes, but the Cherokee and the C-182RG are the other two I use the most from them.
I really like the FFS RV-7, but it's VC hit's my vid card kind of hard on the frames.
The FSD Cessna Skymaster (C-337 I think?)
The Eaglesoft CX. It's just a beautiful bird and a joy to fly.
The T-37 from T-37 sim. It's great having an "accurate" jet trainer to scoot around the FS skies in, but I need the manual open when I fly it, because I don't fly it often enough to know the procedures.
The CS F-104 and C-130. My understanding is the C9 F-104 has a better (more accurate) FDE, but I just love this plane. It's so well modeled. The same for the C-130.
For Modern Military Jets, I fly the Iris MiG-29, MiG-27 (Always a favorite with that duck nose), Harrier, and their F-14. Also, the Alphasim F-22, B-2, Lightning (late series single seater, F.2 and F.6?) and V-22. I would add their Eurofighter Typhoon, but they have the inlet lips always extended/down except during supersonic flight which drives me nuts. They're only down for high alpha and for a little more airflow at very low speeds. So I don't fly it because of that. It's one of those things that just annoys the hell out of me.
The PSS Vulcan. Loud and Proud
The Wop He-219. It's a cool plane I was modelling once and I think they did a good job on it.
Former payware, but now freeware; Bill Lyons Graf Zeppelin. What a relaxing ride.
The entire Georender series. I think Darrington and Forks are my favorites, though. I like the latest airfield, but since I've installed Ground Environment that and another airfield crash my system when I try flying to them. I think it's a texture issue, but I have too much work to do to spend time sorting it now. I could just remove ground environment, but I'm going to upgrade to the pro version instead because I like how much it improves the look of FS.
France-VFR add-ons. Alot of them are kind of hard on my system, but I get alot of my best screenshots over them.
Cloud9's Fly the Lakes and Aviano airbase. I have every intention of getting their Phantom (It's on my birthday list
).