I mostly consider my collection complete. I have all of the Japan exclusive titles plus two of the puppets that appeared in the GC commercials. (or atleast I think they are, but I can't be too certain)
I LOVE Whitney. Haha I own all the Animal Crossing games released in the US, and the little Animal Crossing memory card thingy, and I own a Whitney plush and a smaller Whitney plush. The price on them was outrageous but well worth it.
I also have a necklace someone made of Whitney from Etsy, and I have 2 Whitney shirts I had personally made and another my ex got me with a huge Whitney on it. I have the still sealed Animal Crossing movie, special edition with the DS case, as well as the 2 AC posters from Club Nintendo, as well as the poster with the typos on it.
How I want the keychain of Whitney SO bad. I would pay a lot for it. D: alad it is no where to be found online. I think that's it though. :3
A polished lady will shine brightly in any circumstance - Whitney
I love Whitney, she is my sunrise. << <3 Cory x Whitney <3 >>
I only have AC:NL - for some reason I never have a desire to play anything other than the latest game so I have long since sold my older games. I did have 4 AC:NL copies at the top of my NL playing days but I sold all but my main copy.
As far as other things:
AC 3DS XL
AC 3DS pink game pouch from Club Nintendo
AC playing cards from Club Nintendo
AC sticker/letter book (one of my favorites - I wish they'd publish a book full of in-game stationary!):
AC Japanese art book (awesome for AC lovers)
I used to have a Goldie talking keychain plush but I gave it to a sick friend who loves AC as well. I do miss it so I will probably get another at some point. And I had the AC: NL Prima guide but it was rubbish so I sold it. I wish there were official Klaus merchandise out there. I would buy that up. There are some things on Etsy but they're usually overpriced IMO.