Looked at my PC specs... safe to say I won't be playing anything on it unless I drop in at least 3-4 upgrades. The only systems I play anything modern on now are PS3 and PC, and I still can't convince myself its worth the $500+ to upgrade.
After we mentioned it, I started looking into PCs. I come to about $550-600 to start off with a setup that runs 95% of games on max settings for 1080p and flexibility for some upgrades, and should last 3-5 years before it becomes intolerable. Pretty tempting actually.