...blimey...where do you start...?
I have been collecting add-ons since FS 2000/FS2002 first came out...

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It's a never-ending occupation...

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I think it has taken all of us quite a while to find out about all that is "out there".....
Just keep an eye on things, it's a slow process...!
...and takes a long time...!
Because I fly in quite a small area, generally at low level, some of my favourites have been the latest "Land Class" scenery for that particular area.
The "Weather" add on programs are usefull as well, (a plug for Weather Maker...)...

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LAGO's FSSE also allows me to build up my own airfield scenery, (a plug for LAGO...)....

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"Flight Water Pro" also beefs-up the water effects in the program...

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...that's about it really, apart from the zillions of plane downloads...

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Oh, and a very nice Microsoft Force-Feedback Pro joystick to make it even more realistic...

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Cheers all...!
Paul.
(England).
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.