Being a female, I have some trouble voice-acting my male characters, but in my head they always sound a particular way. I will start (since I am the OP of this thread. )
http://i936.photobucket.com/albums/ad208/xenaclone/Image0143.jpg. As a Redguard thief, I usually hear him sounding just like the guy who voices all Redguards in the game (couldn't find his name after much searching, folks). Kahreem even laughs the same a-ha-ha-hah.
http://i936.photobucket.com/albums/ad208/xenaclone/saga-1.jpg is more difficult to explain. Her voice is definitely not anybody in-game; instead I often hear a female with a mellower pitch. Her voice is British, probably a light Cockney accent. I'll have to post an example later on.