Hi Naruto - I don’t think you’ve received any answer because it’s possibly not been considered as a serious question. To develop a game of this calibre and run the data systems involved would unfortunately not only require an awful lot of manpower but the data servers you’re asking about are likely to exceed the entire budget of an indie. By a factor of a lot. Think $10-15,000 each. Excluding equipment, rack enclosures and the $3,000 per month leased line.
NB. If you still want an answer, consider a Dell PowerEdge R730 with 2 x Intel Xeon E5-2637 3.5GHz, 128GB 2400GHz ECC RDIMMS. Thank you for choosing Dell.