I recently received a copy of DRMcNatty's monthly e-newsletter about their work with Primavera. Under the section "Reduce Costs Associated with Software Implementation" the first line says "Primavera software implementations can be a large and complex undertaking" . When Oracle Primavera's number one partner is telling clients that an implementation is a large and complex undertaking you know you will be spending major dollars on this project. I am talking well north of six figures for a basic installation. What DRMcNatty won't tell you is the best way to Reduce Costs Associated with Software Implementation is not to select a Software Solution like Oracle Primavera. 
When you are buying a legacy project management software application like Primavera the odds of a successful implementation are slim to none unless you have large deep pockets. Today you can remove the traditional implementation risk from the process by selecting a VeWeb Based application hosted by the vendor like EADOC's project management application. By selecting a vendor hosted solution you eliminate buying hardware, installing software, and configuring the application yourself. This process alone delays poses tremendous risk to your implementation.  Also when you call the vendor for support we are looking at the same screen as you, resulting in issues being resolved in hours not weeks. So why doesn't Oracle host Primavera for it clients, because they would have to do an implementation and that is too expensive for Larry.  Now not all new web based solutions are created equal you need to watch out for newer companies who are are selling legacy enterprise software solutions as if they were a newer web based application. A major Healthcare provider recently contracted with IBM Global Services(Major Expense) to try and fix a 10 year implementation of an Enterprise system that has been unsuccessful to date. To help select the correct vendor conduct a Pilot project with that application. Start by asking for a log in to a demonstration site and then take the application for a spin on one of your projects before committing major dollars and thousands of man hours. If you can;t have access to a demo site within a day or be setup on a pilot project within a 1-2 weeks then you are mostly evaluating an Enterprise solution that could take months to years to deploy. Buying software is just like buying a car you need to push the buttons and drive it before making the big investment. 