I really like being romantic, so allow me to chime in with an explicit (whoa! not like that!

) suggestion, building on some of the other posters' comments.
If you don't cook normally, you -must- do the candlelit dinner. There's a reason why it is a classic. And I'll make it easy for you; here's a freaking fantastic cheap, easy meal that will rock your socks off. Vegetarian-friendly. [Disclaimer: naturally this will hinge on your girl's (and your!) tastes.]
You go like this:
Fresh french bread. (Cheap!)
Bowtie pasta. (Cheap!)
One fresh tomato. (Kinda cheap!)
A bunch of fresh chives. (Not so cheap. You just need one of those little cartons, though.)
A stick or less of margarine. (Cheap!)
One small thingie of good, tomato basil feta cheese. (Not cheap!)
So, you boil the pasta, you put the bread in the oven to warm it up, you microwave the margarine and crumbled feta together for 2-3 minutes... Then you toss the feta sauce with chopped fresh tomatoes and chives (chop them small) and throw it over the bowtie pasta. Serve with the warm bread. So easy, so amazing.
I randomly created this meal for my girlfriend one night and it wowed her. I gave this recipe to all my male friends, and their girls were subsequently wowed. Now, please wow your girl as well. We have a name for this dish, amongst my friends... but I permit you to claim you just made it up. ^.~*
Tips:
1. You will have money leftover. Do the flowers-at-work gig.
2. Cut out early from work and make sure your dinner is ready the minute she gets home. This is not hard to do -- everything you have can be kept warm and prepped.
3. Listen to her. Let her do the talking. Pay attention to her clothes -- she is going to be decked out *just for you*, so compliment her for taking the time and consideration.
4. Get some dessert for afterwards. And some scented bubblebath junk for after that... Or during.
5. **Most important.**
Repeat your romantic encounter 1d4+1 days after it occurs. This time, surprise her, mix it up a little, and make her melt all over again.
Yay romance!
