Totally agree with the latter half of this thread.
If the company's game (and they assuredly will be because, well, credit card companies!), raise the limit. Of course, you know, please don't go crazy (you assuredly won't!).
Oh, and while you're on the phone with them, why not ask for a lower interest rate too? Seriously, it never hurts to ask, and if you've got a good payment history with them, they're surprisingly amenable to such suggestions. The worst thing they tell you is no, and if they do, it'll be a good thing to remember when you pay down the balance on the card and begin to think you can probably open a better card!
Anyways, good luck... let us know how it goes!