Deb, it's fine to do that - just be careful not to let yourself go crazy and eat everything in sight on weekends. The average calories is what matters.
That said, most studies find that people who are pretty consistent over the week and weekend in keeping to their diet are the most successful. Doesn't mean you can't be successful scheduling higher calorie days on the weekend (many people are) - just means you have to be careful. So, try it out, see if it works for you.
And I agree (as someone at your height who started off not too far from where you're at) that 1600 calories is probably a good place for you to start.
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