PMDG aircraft have made it to the top of my list of favourites. They've been in the business for quite a long time now, and they really honed their skills as the years went by. Their reputation for first class modelling and technical support is well deserved.
You'll find them online here.
I've got four of their aircraft for FSX: the B737 NGX, the BAe JS4100, the MD-11, and the B747-400.
The BAe JS4100 is another example of PMDG's modelling expertise. Beautifully painted both during daylight hours and at night. I get pretty good frame rates too in spite of the in depth systems modelling. (I took this pic before the release of SP1.)
The MD-11 is a picture of sheer flying might. I love this USAF paint too - just the sort of flying I like to do, military freight with very few passengers complaining about the food or drink!
I remember reading on the forum about how Robert Randazzo likes to see nice clean looking aircraft. Well, I'm the opposite - I like to see scruffy refits from the aircraft graveyard. I like freighters carrying contraband - drugs, munitions, and persons of doubtful character. Hilarious!