After reading through the questions and responses - I would suggest picking up a Nikon D610. It has a smaller form factor, and spectacular performance in nearly all areas. The video has come a long way from the D90, it is useable with an external microphone and proper lighting. The Nikon glass legacy support is great - you can find cheaper entry lenses that still produce fine results. To keep your excitement up, have you ever tried to play with older lenses, or cheaper extreme lenses (like say a 600-1200mm, MF lenses with F mounts, etc, old 35mm lenses, etc)? I find that they are a nice break, sometimes a fun challenge, and produce interesting results - I've even ended up using some of them on assignments!
Wish you the best on your journey!