So Kate, I've tried and tried to post comments on your blog and I just can't get it to work, so I'm gonna answer you question on my own blog!
My three hotters actually show my age because they are all in their late 30's early 40's...Richard Armitage, Michael Fassbender, and Rupert Penry-Jones. If I bumped the list to five, I'd add Max Beesley and Jamie Draven (wow...large quantity of Mancunians on this list!). Bumping up to ten - David Tennant, Mark Owen, Jonny Lee Miller, JJ Feild, and Colin Firth (wow, I could do this all day!).
Popular hotters that I think are total notters are Brad Pitt, Patrick Dempsey, and my total least favorite is Tom Cruise. I've never understood any of their appeals.
Different strokes for different folks! Hope this helps you!