ergophobe - 3:04 am on Apr 24, 2012 (gmt 0)
I've done things both ways, but I've never converted a large site. Depending on how granular the data is, it would be hard or easy (or you could hire someone to cut and paste if it's only a couple hundred pages or less).
Personally, I will never go back to custom-coded unless it's a truly custom application. You just get so much leverage from community-contributed add-ons and you get a nice headstart and can spend more time on creating and curating content.
Can't really be much help with respect to your specfics though.