Kinda really depends on ones Tastes, rather ya like flying newer Type Jetliners, or, Older Vintage style Jetliners

??
Frankly I like the older Vintage style Jetliners, so, I have Captain Sims Boeing 707 package and the Boeing 727 Package.
I also have CLS / Commercial level simulations Vintage 1960's & 1970's era Boeing 747/100-200 package with the Vintage tape style gauges etc.
Captain sim does offer a Boeing 777 with full passenger interior as well as a highly detailed cockpit too.
and also the Lockheed L-1011's as well.
If ya want newer style Jetliners , PMDG's 737-800 series is quite complex I hear & seen, maybe that'd be more up your alley
All depends on your preference & style what a person likes

?
[youtube]http://www.youtube.com/watch?v=iW7qEMb9bi4[/youtube]
[youtube]http://www.youtube.com/watch?v=NMV2GgqXJcs[/youtube]
[youtube]http://www.youtube.com/watch?v=Zvg6_YL8yX8[/youtube]
[youtube]http://www.youtube.com/watch?v=4sMxSId33zg[/youtube]