Be careful with regards to costs if planning to get multiple IPs and multiple HDD & machines.
Nodes receive data pretty slowly, so you should start small, and ramp up little by little when needed, as suggested by @Krystof.
Otherwise you would end up with a monster setup whose ROI would take tens of years…
Have a look at this to estimate your potential gains:
(Copy the sheet to your own Google account for modifying it)