Alphasim makes a "middle-of-the-road" brand of FS birds. They are very nice for the price and offer models not commonly available at that level of design. Plus they provide temendous support.
For instance, give their brand new V-22 Osprey a try and you will be amazed at the quality -- in particular, the FDE. This gal is a hoot to fly.

Also, when they feel one of their designs has become outdated, they offer them for free -- sans panel -- A pretty nice gesture if I do say so.
Panels and sound sets are quite numerous on the various Simming sites, so there is never a problem matching up the bits.