Hi
I am having the 8core system with 4GB RAM. this runs very best… recently we did something which you are trying to do… we made a server and had 3 nodes of i-MAC.. that did for us..
this gives freedom to edit on any node and the footage remains on one system..
ask your hardware manager to so something like that..
and if you are planing to do on single system go for 8 core with 4 gb of ram
you can may be try intensity from black magic for low cost capture and edit card
all the best