Could you tell us a bit more on what the servers will be used for exactly to give you the correct advice?
Do you give priority on low price or high quality?
Could you also explain to us why there's a need for 50x IPv4 ips?
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How about giving a try for Baltic Servers. They have got a nice team of people, really nicely priced servers and their own datacenter in Siauliai, Lithuania (EU). Most likely they can arrange you your own allocation of ip's from RIPE (this might vary based on your location). We can warmly recommend them.
But please keep in mind this; Baltic people and Finns are very honest, but quiet. If 10 words is enough, then we do not use 100 words to describe things - we do not talk about weather, because it sucks anyway over here. Baltic Servers have got an excellent support, but please be tolerant to some cultural differences
We are using OVH for 2 incoming lines and few servers, but these 2 lines are driving us crazy all the time ! And the support (which is at least available and kind), doesn't really know how to solve the problem ! So i don't want to think when we will need to solve some worst problem than a line !!!!