Don't torture yourself, I goofed when applying the screen protector on my first DX50, I felt even worst when I gave it to my friend, cause now he is the one OCD on the screen That damn white fluff
I like the silicon case but like you said, it's a dust magnet. I constantly have to wipe it every time I take it out of my pocket then I show it off.
Silicon attracts many unwanted particle, dust, lint etc. I think DX50 is tough enough so I leave it nude.
To cure OCD syndrome and worries about the smallest of scratches try one of the transparent/clear protector like invisible shield. I have done this with my previous gadgets like iPhone 4s and there are some shops would apply it for you or make a custom cut for any device you like to wrap.
I really is effective protecting the device from scratches and doesn't add bulk to the device.