Well, I'll just have to think for a sec.

A2A B-17, with Accusim
Captain Sim C-130
Iris Avro Vulcan

1. Nemeth Designs "Mil Mi-2 Hoplite". I've owned it since 2005 and always come back to it, even after long absences. A great product.

2. Aeroworx "Beechcraft B200 Super King Air". I think I've owned this one since 2007, and it still gets a lot of use!

3. PMDG "Beech 1900C/D" Owned the C for a couple years now, and purchased the D a few months ago. Simple systems, but still a lot of fun.

1) Alpha Sim F-86
2) Iris Avro Vulcan
3) First Class Sims Hawker Fury

The Alpha F-86 probably has one of the most basic VCs in my entire aircraft collection...but the exterior detail is so good and I find it more fun to fly than any other aircraft on FSX.

The Iris Vulcan is another great aircraft. It's difficult to fly well...and took me a little while to master the many quirks of the aircraft (must have taken me about 20 mins to find out how to start the engines up  ), but once you get the hang of it you really appreciate it. Stunning exterior too!

Finally, the FCSim Hawker Fury. It came in the 'Hawker Heroes' pack (which apart from the Fury is relatively mediocre). It's detailed (unlike the other aircraft in the pack) and it's fantastic to fly. Perfect if you want to fly low and slow.

My least favourite aircraft is the Alpha Sim F-4D Skyray. The VC is neither good nor bad...but the exterior is a bit of a let down (it was released 4 years ago). It's a bit bland to fly too. That's why I haven't touched it in about 8 months.

1. Realair Spitfire: have owned this for many years now and it never gets tiring while flying etc, especailly when you've got a few extra textures for the aircraft too.
2. Alphasim Eurofighter: Had this since i did some beta work & Beta screens for them, still one of my favorite payware military jets out there.
3. Justflight Vulcan: can't find anything wrong with this addon at all, and from what i can remember too, when you bought this either in boxed form or download form, a small amount was donated to bringing xh558 to the sky again.

Oh man, first 3 favorites?! ... That's a tough one to ask 
In no particular order.

- IRIS Vulcan. I just love that plane, the VC is awesome and models are perfect. It's a tough one to fly though, she's big.
- Sibwings Bird Dog. If you like low and slow bush flights, that's the one! Great details on the VC and models as well. Some stability issues with Vista though, and tech support is so-so.
- Nemeth Design MD500. Awesome chopper to fly, fast and agile.

There are so many others though:
- A2A B17 and P47
- PMDG Jet4100
- Aerosoft F16, Twin Otter, and Catalina
- Vertigo Sim SBD Dauntless
- FSaddon Lysander
And so many others...
I'm addicted 

PMDG MD-11
Flight1 MD-80
Realair sf.260
Carenado planes