Site Builder or Business Builder?

I've spent weeks trying to figure out the best way to host my new membership site. Today I'm thinking I chose the wrong package. The software is jam packed with features and is really promisIng but it's fairly new, a little bug-y and I've had a few tickets in to support already. Imported old shop tonight and it didn't quite work out.

Thinking maybe stick with Zen Cart, which is free, and figure out a way to offer membership, or maybe buy aMember after all.

Can't unleash my huge mailing list onto a site with bug-potential - want to build my business not sorting out technical problems with the site.

Wish Site Build It! had membership options. Had issues with aWeber too.

Feeling bit sad as well tonight - DD1 leaves primary school tomorrow. Don't want my babies to grow up!