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I think a 3.0ghz single-core processor + 1 gb of ram its enough, 2mb of net should be ok, but well, idk about net

So I am best looking at more brute "ghz power", than multiple cores?
Was going to use a stripped down 64bit gentoo, but unsure if the AA2.5 server supports 64bit OS.
Ram is no issue, Internet is fibre.

nope, I said single-core because I think one core should be enough to run it without any problem, the game itself doesn't use more than 1 core(old game), dont know about the server  ,  generally 64bits OS can run 32bits applications,

edit: Server will run fine on 64bits, there was a server running on Debian 64bits:D

Higher clock per core will be better for AA due to the game being single-core (no outside tweaks will ever change this). I don't think you need a fast CPU for the server though, I think it's more dependent on disk speed (map changing) and internet latency.

Overkill IMO. That $60+ would be better spent as $5 or $10 a month more to your ISP for faster speeds, especially if you have multiple computers in the house.

100mbps down/40mbps up with 5ms to the ISP POP ok?

I have run ArmA2 server in the past, and it has killed my Internet and server.
No trolling intended spanky, was just asking.

I think a 3.0ghz single-core processor + 1 gb of ram its enough, 2mb of net should be ok, but well, idk about net

I would equip it with more ram.

 The performance of one AA server is especially affected by OS+CPU+RAM+NET.
OS- I would use linux (very stable, secure, fast and beat windows in server environments)
CPU- Stronger CPU will not lag processing information (scanning tools , etc etc...)
RAM- With more RAM you will deal with less need of the HDD and as you know the HDD is slow reading/writing  "instant" information (this factor is very important too to have more players without lag)
NET- Stronger net will result in faster upload/download package stream (more online players without lag)

 The grafic card doesn't matter because it will not run in graphical way....And i recommend to you not play on that computer or you will lag.