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It's hard to write this kind of code without being able to debug it, but hopefully this will point you in some sensible directions.

First my assumption - based on the URLs you included, I'm assuming you want to rewrite http://www.diamondgeezer.com/anything to serve http://www.diamondgeezer.com/theultimate/search/index.php?sortprice=asc&followSearch=9673&q=anything behind the scenes.

I think there might be some complications around replacing hyphens (-) with pluses (+), but just serving the search results page for the word appearing after the first slash should be as simple as:

^/(.*) /theultimate/search/index.php?sortprice=asc&followSearch=9673&q=$1 

The documentation here should help:

http://httpd.apache.org/docs/current/mod/mod_rewrite.html

Note that linkstant works by detecting new referrers so only finds links that people actually click on which is relatively unlikely to include any of the low quality links the OP is worried about.