As others also said, putting all these on a RAID-0 array is really not reasonable. That would have you gain speed but it's not reliable at all. Even if a single drive fails on that array, you will lose all your data. You better think RAID5 or RAID10 as Andrius said.
There you should be able find plenty of providers who can do this config with mentioned IP amount.
I may also suggest new E5 series CPUs instead of relatively old E5620s, just my opinion.
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Do you require server management or are you confident that you'll be able to handle administration? For unmanaged I'd suggest getting a quote from Limestone Networks for the hardware you're looking for. I've had servers with LSN since around June of 2012. Extremely solid and reliable. Not sure how many IPv4 addresses they can give you off the bat. You might be able to get something like a /28 to start with and request additional allocations on an as-needed basis. www.limestonenetworks.com - Good luck
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Most provider won't be able to hand out the amount of IPs to you, even if you can justify.
Although there are some who still have enough IPs, so with justification (which you have) it should not be any problem.
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