I know a good one in The Netherlands. It specializes in Unit 4 Software in combination with Magenta. If that happens to be what youi're looking for and the distance to The Netherlands isn't a problem (you pay their travel expenses, of course), I can recommend it.
But maybe you're requirements are different?
I would like to implement ERP system to my company. I would like you to suggest some ERP solutions providers for ERP implementation, customization and support. And suggest me what an ERP solution provider should have? Thanks in advance.