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It also depends on how many pages you have, how much content, and how it's encoded now. If it's a royal pain to get your old content out, expect to pay more.
There are a couple of reasons a good design could improve your rankings, and as already mentioned, only one reason it could potentially hurt, and that's if your new coding is so bad the spiders can't even read it. ( 20 years ago, I would have laughed at anyone who told me spiders would be able to read. Now we cater to them. ) It can help your rankings if it's more semantic than the last one ( uses h1 and h2 tags properly, has good titles, et cetera ). And Adam proposed the theory that spam sites tend to be very poorly coded, and that in the future this may become important.
Now because you're just changing how you present your content, and not the content itself, none of your URLs should change ( rank is assigned by page, not by domain ). And your site shouldn't go down. A good coder should do this one page at a time, in such a way that a new page is only published when it's finished, so again your content won't disappear briefly and make the bots think you downsized.
Looking over your site, it looks like there are a lot of tables, you need a much more pleasant and artistic look, and you've got an awful lot of articles. I would expect to pay about $400 for a good, but low cost job.
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