ok... ... ...
that's quite a big ask.
if it's a project then you're going to need to (in your report) cite where you got the figures from.
literally go to dells website and see how much their servers cost
ontop of bilbus's list, don't forget some backup software, something like backup exec/netbackup/arcserve etc
for server prices check www.dell.com
for most hardware/software you can check on www.dabs.com
your backup generator will be something that you'll have to find out yourself, I don;t even think I'd know where you;d look for something like this.
and check commercial air conditioner websites for the cost of the cooling,
for extra marks don't forget to increase the budget of each big ticket item, (like generator/cooling/racks) and add words like contingency. in case of installation delays, unforeseen circumstances.
oh, and check on monster jobs for an idea of salaries for your employees.
don't forget that you'll need in your coding team.
project manager x1
technical lead x1
programming team x however many you need
marketing analyst x however many you need (1?)
tester x however many you need (1?)