Not single, still married 15 years now and a serial relationship/dater before that, but just to wade in to agree about the quiet bloke thing.
I wasn't actually looking for a relationship when I met DH, but he was one of those "quiet career blokes".
He was dragged out to the pub one night after work, I knew of him from the organisation I was working with at the time and had never "noticed" him.
But he was standing shyly at the bar with the colleague giving me the glad eye because he'd had a few drinks and it was obvious to me that he so would if he could.
I started to think about him a bit after that and there seemed to be chemistry when we bumped into each other around the building. And he started hand delivering all his memos and letters for my boss to me!
He never seemed to come to the pub so I hadn't seen him since out and about. There was a leaving do one night, a few months after I had originally noticed him and I said to a colleague "make sure xxx is there tonight". He said "who's asking" and I said "never you mind, just make sure he's there!".
He was there 
Colleague was a total gob shite who obviously told him who wanted him there which I was kind of banking on I guess, so DH had the balls to come up to me and start chatting when he arrived at the bar. He asked me out for the following night and we went to Chinatown and snogged in the tube station for ages.
I went back to my flatmates and said "I'm going to marry him!".
And I did 