I am currently planning out my next "main" character and im completely lost as to what race it should be. I'm one of those people that if it doesn't fit the role play then the immersion is gone and I loose interest. So anyway, any help is appreciated.

This character will be a nightblade (night blade?) vampire living a second life in the swamps with a wife and two kids. I will be joining DB, TG and CoW. I'm thinking maybe altmer but they are not known for their stealth skill so now I think dunmer would be best. Who do you think make the best vampires?

Really excited for dawnguards ps3 release tomorrow and hope it's as good as it looks.

Dunmer works well for what you're describing.