My suggestion is to have a good read of the threads about each rewrite product and then make up your mind. In my opinion there is only one that is fully developed and stable, and fast.
With sitemaps, I recommend that you use one that is created via the database, rather than by spidering your site. There are many url's in a forum, not all of which you want or need ranked by the search engines. You will have a lot cleaner sitemap if it is generated from the database.
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