Understand, however, that the more you customize your site, and the more sophisticated your database becomes, the harder (and costlier) a future migration will be.

Make sure that if you do decide to move onto another script, you stay with it. Script-switching is a torture, and you should only do it if you are 100% sure the move will generate the results you are not achieving with the current script.

More than often, a site's success or failure relies not on matters of scripts or pretty designs, see more but content.