Lori,
Here in NYC I get between $50 and $65 per hour as an editor, depending on the job, facility, client, budget, etc. Most of the time taxes are taken out, some times they are not at which point I slot away 1/3 for Uncle Sam.
I have just taken on my first project on my own FCP system; 6 weeks, documentary, 49 minutes TRT. The budget was fixed at $18k for the offline. I just got the finishing/online for an additional $4400 for 4 days. All the days are 8 hr days. NO OT! This was all negotiated and agreed upon weeks before starting, IN WRITING!
In NYC I know guys who get $1K per day(8hrs) for them and their rig.
I would venture to say that you should be able to get $600 per day and up. I would not go any lower than $600 for the type of work that you are describing.
Good luck
Biker