hi i have 500 smackers to spend on upgrading my pc im curently on i5 2500k ocz 700 wt psu 16 gb corsiar ram cosair h50 water cooling gtx 560 ti twin forza m/board msi gd53 what would be the best option to go for mfsx sim .do i go for an i7 2600k or stay on i5 and upgrade the gpu to a gtx 580 .alsowould my graphics be any better moveing upto an i7 2600k with the gtx 560 ti