PowerCMS2
This looks good but its price will prevent me from using it
At $99 or £75 per site it is cost prohibitive - It's the ideal tool for little sites with limited budget which typically go from £250 to £350 in the UK.
The switch from one per developer to one per site just blows it out the water when you can get a host of CMSs for free or a much more comprehensive solution such as InsiteCreation2010 for $79 per site.
You really need to think more indepth about your relationship with me the developer and how much longer you want it to continue.
Kind regards
Jon