We need to setup 10 dedicated servers plus a 1GBit line on Europe, our main goal is to setup a very good network that will be used to download files from Spain. We need excellent network connectivity from / to Spain, that includes a very good download speed and also an stable network.
There is no such thing as best dedicated hosting provider. Before you choose hosting provider, be sure that you're aware of your needs. Then you can make selection of hosts that match your criteria and check reviews of them. But be careful with reviews, read them but don't trust them. Take them with the grain of salt.
"Just think of that used car salesman attitude while you’re reading those hosting site reviews. It may sound like a Jaguar, but you’ll probably end up with a Yugo."
Quoted from: http://blogongeek.com/behind-hosting-reviews
Does the gigabit line need to be unmetered?
Do you have any budget available for this?
I also agree that a US provider is a bad choice, cause connections to Spain will be very bad compared to a decent network in EU.
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Leaseweb in our tests get worst speeds, but we have news that in september, they will improve their network. Normally also I get better speeds from UK providers than Germany with Telefonica.
Also you can choose an spanish "pure" provider, with infraestructure . I recommend you dinahosting.com (they have very good reputation),
or go directly to housing in one of the stablished datacenters (Telvent CarrierHouse, Globalswitch...etc)
Telefonica lets its peering on AMS-IX and DE-IX suffer a huge congestion in peaktimes, thats why hosting with a party that peers with Telefonica on a public peering point is not a good idea.
OVH and Leaseweb are both content providers. Telefonica is 'mainly' an access provider. Usually peering would mean mutual benefit, but Telefonica is the kind of business that wants payment for peering with smaller parties. OVH and Leaseweb seem to peer with Telefonica on public exchanges.
Get Teliasonera or any party that is a large as Teliasonera that has private peering with Telefonica to host your content. Alternatively you should consider working with parties that use these peers as transits.