well you don't really need a killer system to play EB since well as since as he said, we can puase and do watever we want. You don't need anything fancy just because other people has it, get what suits you the best. Im a dedicated gamer which has a life outside of my "gaming world" cough...crysis,callofduty4,battlefieldserries,fuelsofwar...cough

I use what best suits me, a plain old logitek comfort keyboard (comfortable xD)
a microsoft comfort mouse.. (hey i play a lot of games, cant play if hands hurt lol)

intel quad core qx9650... oc @ 4.3ghz...
ddr3-1333mhz corsair terminator ram....
quad sli geforce 9800gx2...
nforce 810sli enabled mobo ft inel quad core
average of 146 fps with everything on high in battle mode of at least 5000-6000- sometimes above 8000 but they wait on edge of field

Man i think i totally overkilled and im feeling like im just bragging about my system
im sorry guys
ill just play this on my old old emachines to feel like you and lag!
:D

conclusion
get whats comfortable/affordable but good quality and your all good