It is absolutely worth it to upgrade. Do it! Also, excellent choice on the CPU.
it's worth the upgrade, but imo, it's better to wait for intel's new chips.... cause the chipset 1155 is dead after ivy bridge. so you'd have to buy a new motherboard for future cpu upgrades... But yes. it'll provide a huge boost to your frame rates if you upgrade.
(hanswell launches in about 6 months)
and intel usually keeps the sockets for at least 2 generations of cpus.