IT Value Added Resellers in Europe/globally

Hi, Can any of you suggest competitive IT hardware Value Added Resellers with presence/business in Europe who also scale globally. We use local suppliers only today, but want to consolidate. Have appx 30.000 employees in Europe with 20.000 in Northern Europe. Our current list includes Kelway, Insight, Zones, Dimension Data (and IBM), but the market seems relatively difficult to scan and everybody we contact claim they can deliver... Thanks! Rune