When I was with NSPE we used Agilutions in lieu of the organization support that came with the package implementation. We needed customizations and reports and someone on the team used Agilutions previously. They were very helpful. Steve the CEO heads a really good staff of people.
Assume you will only consider US based firms? My UK based Netsuite partner has delivered on projects for a high end French fashion subsidiary and global market research company in the past 24 months. Happy to make an introduction if you still neeed to resolve your challenges.