Just a few insights:
I3d - Has super slow speed when transferring files to and from USA servers. But with Europe, they are ok. Their pings are great though, I guess they are much more concentrated on game servers and latency.
Nforce - Excellent network within Europe -NL, Germany, France. It is a bit ok when connecting to us servers too, about 5 MB/s coming from Dallas and they got unlimited incoming bandwith (similar to OVH). Their servers and hardware are really cheap too, so its easy to upgrade if you are on a tight budget. Also if you aren't picky about disk brand - they use Hitachi for their drives.
Global Layer - They have excellent network but their downfall is the price. Hardware upgrades cost too much, also their bandwith is limited. One thing that they don't say on their website is that they only offer KVM/IPMI to reseller accounts. Also, you can't do automatic reinstalls if you're only a private user.
Leaseweb - I don't know but I think since Leaseweb booted some people/companies who have been abusing their network, their 100tb servers have drastically improved. I've been getting great speeds from them. One thing about them though, some filehosts banned Leaseweb's ip ranges - but there are workarounds for that.
My advice would be to go to Leaseweb or Nforce