Hey guys, sorry if I'm on the wrong board.

So I have had my eye on this girl at work off-and-on for about two years but have always moved onto other girls instead of pursuing her. We have good chemistry and last year when I was involved with another girl she seemed really into me (not out of jealousy though, the relationship was a secret work romance.) At that time she also started dressing and looking so very hot that she was driving me crazy. I couldn't keep my eyes off of her. I doubt she was playing games to catch my attention though. She had been improving her overall look just as I had.
So anyway, after two failed work romances followed by the inevitable awkwardness, I decided I couldn't date/be involved with girls at work anymore, as much as it was killing me to not "make a move" on this girl. Honestly guys, I have never been so attracted to someone in my life. It's not just looks either, she's the whole package: brains, a future, everything. Added to my no-coworkers rule, I figured that the universe gave me opportunities to date her before but I always passed her up for someone else, so basically I had my shot and blew it.

So today I found out that she's leaving her job at the end of the week. At first I was disappointed that I wouldn't see her anymore, but then I realized this opens up the door to ask her out since we won't be co-workers anymore.
Problem is, I don't know how to ask her out now that the opportunity is there. We've known each other for two years (?) but we never really got to know each other. We're not strangers but I doubt that I've made much of an impression on her/created much rapport. Though, she does still show interest in me from time to time. When we do talk, it's all smiles both ways and she takes interest in my knowledge or opinion on things.

So how do I do it? How do I ask her out? Or has that ship passed?
I had this plan: Casually tell her to give me a shout sometime, we'll (insert possible activities here) or something. It'll be fun.

That seems good enough right? It gets the message across that I would like to see her but isn't overtly come-on-ish.

And please don't give me one-itis talk. I've been with other girls and believe me, my eyes are open to many many others. I just don't want to miss this opportunity. I feel like the universe has finally opened the door for me.

(Wow that got long winded quickly)

Go for it. the dressing up better thing is a sign and if shes leaving in a week what do you have to lose? do it and get it over with id rather know then live in regret of what could have been just say "Hey i want to take you out what do you say?" its straight foward which she will love and Two years?? i mean gosh man you've got this

Yeah I plan to go for it. I have very little problem with directness. Eye contact - piece of cake. I do though, have a problem with finding the opportunity. We have very different jobs in different parts of the building and I only really have a chance to talk to her for a couple minutes. Even then it's not alone. I don't need anyone overhearing and starting the whole workplace romance rumour mill I had to deal with in the past. Added to that, I am only at work again Wednesday and Friday. Wednesday there is a going away party and getting to her then will be like fighting back the tide, and Friday gives me the couple of moments window. It's very difficult. I don't want to resort to Facebook.

What really worries me is that I have been cold to her quite often, mainly to prevent myself from becoming to friendly and getting in too deep (falling for her and opening up a can of workplace worms.) Not cold as ice, but just not starting conversation or even saying hi every time. So I fear I have put myself in a unfavourable frame in her mind. Although, when I spoke to her today, all smiles and eye contact throughout.
To add to my story, when I was seeing someone else, I pretty much ignored my co-worker/the girl in question, and that made her even more attentive toward me. But after trying to get my attention (assuming she was) for about six months I think she just gave up and thought I wasn't interested and never would be. So I think that really hurt me. Hey, maybe not. But what was I to do? Break things off with a girl I was mad about because someone else was paying attention to me? No.