We have found that hiring a private shuttle more cost effective when there is a big group of you. We have used RS transport which has recently changed his name to www.bstransports.com. We read about them on the Dis boards and were not disappointed.
The driver was waiting for us in arrivals and we were loaded up and driven direct to our hotel very quickly.
If you look at the information thread at the top of the page you will find a selection of links to various shuttle companies and the VEA so you can compare costs.