I have been focusing on the 744, 773ER and 738W and some 788 just because I think they are beautiful :) I have a few Airbus though. My collection consists mostly of planes with special livery like the 'All Blacks' from Air New Zealand, the green Cathay Pacific planes, the tribal Qantas 747.
The ANZ All Blacks are becoming rare nowadays so grab one when you see one. I have a Canadian airlines 747-400 in my collection, you know the blue bird on the tail.
I started collecting airliners because I've always thought going to the airport and watching those planes takeoff was the coolest thing. Plus, this will give me a diverse collection with all the different models and airlines.
http://www.thresholdaviation.com/air-new-zealand-787-9-all-blacks/ Maybe they ship to the US.
There are a few of them on eBay.