So, being a (rather lazy) wimp, I'm only posting pictures of my two favorite doctors :)
The eleventh doctor...played by David Tennant! He's a bit cookoo, but that's why everyone loved him...I suggest starting on his season...very entertaining, and it will catch you up on what you need.
And Matt Smith. He is the overall favorite doctor, though I personally prefer David Tennant...I guess you'll just have to watch and find out :)
Hope you are now looking forward to watching!