Getting rid of my watch collection...bad idea?

I recently purchased a grail of mine, a Casio MRG-1100 Frogamn. I payed quite a pretty penny and now I feel like I must sell a portion of my current collection to compensate. (I also promised my girlfriend that I would ) I currently own about 12 watches, a majority of them casios. I don't really need the money and was wondering if it would be a bad idea to sell? I don't want to make a decision that I would regret. I also wear many of the watches that I own because I like to enjoy what is in my collection and I know that the longer i keep them the more they will depreciate : ) Currently I am thinking of selling the watches that I do not wear so that they can fall into the hands of someone who will appreciate them as a collectible.

Here is what I own:
Casio DW-5200
Casio G-2000
Casio Protrek PRW 1300t
Casio GWM5610
Casio Giez Gs 1000
Casio MRG 110t
Casio DW 8900 (US release of MRG100)
Casio MRG 220t
Casio TC-600 (touch screen calculator watch from 80's which perfect crystal and is fully functional)
Casio DEP 700
Seiko Black Monster
Pulsar PS7001

Is it worth selling any of these? Deep down I feel like I should keep all the MR-G's, the DW-5200, the G-2000 and possibly the Seiko so that I have an analogue watch in my collection. The rest of the watches would be sold.

What would you guys do with a such a collection? Which ones would you sell? Which ones would you keep? Why?

I would really appreciate any replies! Thank you!!!!