When we go live, we will have a dedicated server, or we may consider a zope hosting company. At the moment I just want to be able to run Zope and we already have all our stuff set up with aletia. I don't need superb performance at the moment, just a useable Zope system for some training and development.

Zopehosting shouldn't be done only because it is 'nice to have'. Have a look at an ISP that specialized in Zope hosting and continues in fine-tuning like e.g. http://www.zopehosting.ch