There is a GPS Discussion thread in the "Related Topics" area over on TBN that talks about some pretty remarkable (to me, anyway) capabilities of fairly inexpensive (easily less than $400) GPS units.

Gregg, you say </font><blockquote><font class="small">In reply to:</font><hr />
If I do get this plot plan, I'm hoping that it, along with some careful searching for permanent survey posts that should be present,

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I'm thinking that you should be able to use the plot plan or the survey map from the previous survey, plus one of those GPS units to go lay out your property lines yourself. The GPS will at least help guide you to the exact spot to look for the permanent survey posts.