From their end, I want this to look as much like a professional hosting scenario as it can; from my end, I want it to be as self sufficient as possible, so we're looking at giving them the ability to manage their email, dns, databases, files, etc.
This is not going to be a hosting company, our work keeps us busy enough that we are not attempting to create a subsidiary business venture, just provide the same services to our clients that another firm would to keep them (and their money, I won't lie!) as close to us as possible.
We want to keep the barrier to entry as low as possible for ourselves, but at present we are also considering the services offered by Rackspace Sites, despite a sour taste left in my mouth from their child Slicehost.
As of right now if we stay the VPS route, we may just dive in headfirst with cPanel. I love free, and I love open source but in this particular case it is our clients needs we must address and if the public domain doesn't cut it, then we will have to do what we have to do.
