Keyword Rich Static URLs vs Simple Static URLs

vBSEO choice

[turkerm]

Hi,

I'm thinking of buying vBSEO, which SEOs vBulletin Forum software with keyword rich static URLs and many other optimizations.

My current site has URLs such as thread123.html

I have two options:

1) Going for keyword rich URLs by 301 redirecting old ones. (have worries about using my rankings?)
2) Configuring vBSEO to implement my usual URL style (thread123.html) with no redirection.

Which one should I prefer?

[kidder]

Good content on your forum.