If you like vintage aircraft's, then those made by Jens B. Kristensen is among the best.
They very detailed, well documented, with VC, with installer and just plain awesome.
I have them all and they are my favourite planes to fly.
Here a list of what he has build so far available for FSX..

Armstrong Whitworth AW15 Atalanta
Avro 504N
Avro Ten (Fokker FVIIb/3m)
Boeing 247 and 247D
Boeing 307 Stratoliner
Bristol Brabazon 1
Canadair Argonaut & North Star
Canadair C-5 North Star (DC-5)
Curtiss-Wright AT-32 Condor
De Havilland DH.91 Albatross
Douglas DC-4 and C-54
Douglas DC-6 (early version)
Fokker C.V-M/26
Fokker FVIIa
Fokker FVII/3m
Fokker FVIIb/3m
Fokker F.XII Trimotor
G.A.L. Monospar ST.25 Air Ambulance
Handley Page W8b
Lockheed 9 Orion
Martin 130 Clipper
Republic F-84G Thunderjet
Short Empire flying boat
Short S.5 Singapore I
Short S.17 Kent
Short S.17L Scylla
Short S.25V Sandringham
Short S.45 Solent
Short S.8 Calcutta
Vickers Vimy Commercial
Vultee V1A

No less than 31 aircrafts, and several of them comes in different versions and paints.

He is no less than the top aircraft designer in my eyes.