Ok, this one was tough... I voted for the 777. A good 777 is non-existant in the FS community. WE NEED ONE! So, even though I've heard rumors that "others" may be looking at the 777 after the 737 NGX release, I'm still voting for it here, since with the "others" it is, after all, still a rumor.
Was a tough choice though with that and the 731, 732... We have good 737's out there but they start with the -300 model. Since most -100's and -200's seem to be retired I leaned to the 777.
The DC-10 and earlier 747 variants (they are out there but very simply developed compared to todays standards) were under my button as well as the SAAB 340! Like I said... Was a hard one for me!!  LOL...

If the RFP 747's were FSX compatable; that would alleviate some of the pain here... LOL...

Thanks!
Robert