Opinions on social network/dating site software

[gnubler]

I'm currently running a free dating/personals site with Boomex's Dolphin (http://www.boonex.com/products/dolphin/) software. While attempting to upgrade the software, disaster struck and without going into all the gory details I've decided to rebuild the site with different software. I'm currently researching the following systems and I'm wondering if anyone here is using them and what your opinions are.

Bitweaver (http://www.bitweaver.org/)
I'm thinking this might be more like a Joomla type of CMS...not sure yet if it will work as a dating site.

Drupal (http://drupal.org/)
A very popular CMS, but apparently with a steep learning curve. Again, may be more similar to a Joomla powered site, but it has hundreds of addons that I haven't fully researched yet.

PHPizabi (http://www.phpizabi.net/index.php?L=home.index)
I'm leaning more toward this right now as it seems to fit my needs. It claims to have over 200,000 downloads, yet the support forums seem a bit inactive. I'm not sure if that's good or bad.

Elgg (http://www.elgg.org/index.php)
This also looks good, but there is no online support/forums and that scares me.

osDate (http://www.tufat.com/s_free_dating_system.htm)
Another option.

I only started researching these yesterday, but I need to pick one and get going fairly quicky. If anyone has any feedback, please share.

[socializing]

Chameleon is good if you buy a unique design, because in this case you will have a unique site. Some of the designs can be seen here chameleondesign.net/gallery.php?gid=52
But if you get it without it it is useless because no one likes clone sites. Also their support may be sometimes slow, but i am using their script on 2 sites of mine (they are listed here chameleonsites.net) and everything is ok.