Well, honestly, what's going to attract me to a person first is how he looks. Is he hot, and/or does he look like he knows how to take care of himself? Then heck yes I want to get to know him. Does he look like he lives in a basement and doesn't own shampoo or a razor? I'm going to turn the other way. Whether or not someone takes pride in their appearance says a lot about them, emotionally: if they want to look good and take the time and effort to do so, they probably have self-confidence and pride in themselves and that's pretty hot. Plus I like to look my best and I appreciate if the guy I'm with is the same way.
Purely physically I think my ideal man would be tall and muscular (not too beefy, but I do like biceps, pectorals, back muscles, and dem thighs... so basically, professional soccer player build; yes I am still in World Cup mentality) with broader shoulders, curly/wavy blonde hair cut relatively short, and dark eyes. Dimples are adorable and I really like nice hands and forearms. Mentally I like someone who doesn't take themselves seriously and who can laugh at just about anything. I'm not a serious person and I don't want to be dragged down by someone who feels they need to be. Nerdiness is a huge bonus, but it has to be the right kind of nerdiness: I'm more a fan of western nerdstuff in general and I'm not really into anime at all. If he likes anime like Cowboy Bebop or Samurai Champloo then that's badass, cuz that's like... Manly anime? And that's chill. I don't think I'd exactly be turned on if he was all into Tokyo Mew Mew or whatever. But stuff like Star Wars, Star Trek, Venture Brothers, superheroes, comic books, that's all awesome and if he was big into that I would jump for joy (probably literally). Intelligence is also a huge thing, but not just booksmarts, since I like a man who's socially intelligent as well. I hate it when I'm with someone and I'm talking to people, and I feel like they're all awkward because they don't know how to socialize. And finally, just having a good sense of humor and personality that meshes well with mine is awesome. I want to feel like my dude and I have a total bromance, except that I'm a chick. If I feel like he respects me as a friend in addition to a girlfriend then I'm going to like him that much more.
Bonuses: I'm not clingy. I don't want him to be. He needs to be fine with me running off to do things by myself, and needs to feel fine doing the same. Also, I'm pretty atheist, and would like if he were the same or similar (but really, as long as he's not going to try and get me to go to church with him or pray or whatever I'm probably fine).
tl;dr My ideal man is Sherlock Holmes with like 20lbs more muscle