Raising my rate?

Hi - I read through a good amount of the archive, but I don't think I've seen anything on this issue.

I charged $1100 for a videography gig I did last year of a dance recital. There were two days of shooting (one just a few hours, the other about five or six hours) with my own DVX. The first day was easy behind the scenes stuff, and the second was the main show.

However, I also made a DVD (with basic menu/music) and used DiscMakers to make 100 copies of the disc. I made an initial rough cut disc for feedback/criticism, and then sent out the final cut to get mastered. The final copies had art on the discs and case (front/back, no insert) that I designed/laid out in Photoshop.

Looking back, I spent more on production costs than I hoped. The duplication alone cost about $350. The location was over an hour from my home, so I had to pay gas/tolls/etc.

I was at first happy with my $1100 (as it was my first gig I got - got it right while finishing college), but now I'm afraid I've set a precedent of a price that's too low. I'll be working with them again this year.

However, I'm afraid to negotiate a price I already agreed to last year. Is $1100 fair for a recent college graduate (I've only been out almost a year now), or should I be asking for more? I'm starting to wonder if $1300 or $1500 is more fair. And if so, how do I negotiate my price UP instead of down?!