Did I Make the Right Play?

[The Lipo Fund]

I know you guys get tired of endless tipping threads but I am genuinely interested as to what you would have done in this spot:

I am walking home from campus today and stop at a pizza place for lunch. I'm thinking to myself I have $7 in my pocket which is ideal, since I get a $5 lunch special (2 slices and a drink). I'm finishing my meal and notice I only have $6 in my money clip. I have a debit card with me, but I hate to use it unless I have to, so I was really unsure of what to do.

First, I wasn't really served, I seated myself and got my own drink. The guy brought me my pizza and asked me if it was good. So I was thinking just pay and leave no tip, or just give him $6 and tell him to keep the change, but giving him .60 seemed like a douchier move than just not tipping at all. It was my first time at said restaurant, and I enjoyed it and would like to go back some time, so I ended up using my debit card to pay for it, and I gave him a $2 cash tip on a $5 meal.

In my spot do you:
-Just pay for the meal; leave no tip
-Give him the $6
-Use the debit card and leave him a decent tip
-Leave no tip, but be sure to tip double the next time you come