Sideways,
Firstly good luck and happiness to you on the way into the big bad world.
In answer to your question, I think your suspicions are correct. It is said that your CV is only as good as your last job. But Anotherthing is right, better to be an employed job seeker. I doubt that a short term "stopgap" will harm your prospects, but if you've been stacking shelves for three years, you might not make the short list for that CEO's job. I'm sure you see what I mean.
There is no easy answer to this, but my thoughts are that it may be worth waiting a few months for the dream job and if you need a stopgap, make it the best you can find, even if the money/location/hours/job aren't perfect.
Again, really good luck.
Courtney
P.S. Excellent words above [edit: and below], guys!