[quote]The thing I wish to add is your collection is your collection. [/quote]
Echo. This is very, very important. Do not collect to impress other people on the internet. Do not collect as an investment. You will become a very angry person. Cel collecting already has too many angry people. We here at Rubberslug want you to be a happy person.
Collect whatever you want. We'll love you anyway. Heck, collect cels of rabbits. Or bento boxes.
Other things to add:
1) After you collect for a few years is that you'll realize that these things are cyclical. Look at Gundam Wing prices now. Far from the strongest show in the series, it commanded prices that are maybe 300-500% of what they are now simply because it was popular on Cartoon Network. Right now, the big inflated series seems to be Inuyasha. Feel free to collect current "hot" shows knowing that in two years, the money valuation of your collection may drop by 1/3 to 1/2. If you're worried about losing money then diversify, which leads to point #2.
2) Watch a lot of anime. Watch animation from other countries. Study it for film-making technique. Basic illustration ability helps. This sounds insane, but keep in mind you are a bonafide art collector now. Know your art. Anyone who says that centered front-facing characters are the only good cels cannot draw. Period. Having some experience in figure drawing and/or understanding cinematography clues you in to the fact that many shows are filled with people who draw far less than perfect. (If you can find Studio Ghibli rough pencil sketches, you'll see what people who *can* draw look like.)
3) As a point about "collect what you love"... To me, the most impressive collections are from people who collect atypical series with a serious passion. I've seen entire collections based on Saint Seiya (
http://saintseiya.rubberslug.com/) or Aishite Night (
http://linda.rubberslug.com/). I haven't seen either of these shows, but I know that only maybe 1 in 1,000 anime fans will share their passion. That's respect right there. I'm not saying go run off and collect an older show, but find something you connect with.