Check back in the past week -- I posted my own feelings on a number of SQL backed add ons and add-ins ... forum, ads, etc software.
After looking around, I feel for a "professional" and/or "commercial" site, whatever term you prefer, the features and advantages of wwwThreads put it at least a step or two above Phorum. There is also Sporum (perl based, not PHP based). Again, I chose the $200 for wwwThreads after 3+ months of looking around, and checking out code, and features, etc.
That's my opinion ... and I don't officially endorse anything ... I do hope that there is ALWAYS a choice ... and the 3 contenders were (IMHO) Phorum, Sporum and wwwThreads. I chose wwwThreads....
If you are going PHP, and want to use more PHP, then go with Phorum. If you want open-source, free code, go with Sporum.
Otherwise, since you plopped down $450 for LinkSQL, I think I put wwwThreads into that class, which is why I went with it.
I did try a few others, and originally ran UBB-free ... I just didn't like them.
For a pretty complete list -- check out cgi-resources.com and of course phpwizard.net
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