Worth the purchase?

I currently have:
-[MOTHERBOARD] Asus P5N73-AM Motherboard - NVIDIA GeForce 7050, Socket 775, µATX, Audio, Video, PCI Express, 10/100 Ethernet LAN, USB 2.0, Serial ATA, RAID
-[PROCESSOR] Intel Core 2 Duo E7400 Processor BX80571E7400 - 2.80GHz, 3MB Cache, 1066MHz FSB, Wolfdale-3M, Dual-Core, Retail, Socket 775
-[RAM] Centon Dual Channel 4096MB PC5400 DDR2 667MHz Memory (2x2048MB)
-[GRAPHICS CARD] EVGA 01G-P3-1371-AR GeForce GTX 460 Video Card - 1024MB GDDR5, PCI-Express 2.0, Dual DVI, Mini HDMI, SLI, DirectX 11, Fermi;

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I'm thinking of upgrading to:
-[MOTHERBOARD] G452-7976 ::GIGABYTE GA-H77M-D3H Motherboard - ATX, Intel H77 Express Chipset, DDR3, USB 3.0, RJ-45, HDMI, DVI-D, SATA 6Gb/s, AMD CrossFireX, RAID
-[PROCESSOR] I69-3570K ::Intel Core i5-3570K BX806237i53570K Processor - Quad Core, 6MB L3 Cache, 3.40GHz (3.80GHz Max Turbo), Socket H2 (LGA1155), 95W, Fan, Unlocked, Retail
-[RAM] P33-6301 :: Patriot Viper 3 Extreme Performance Black Mamba PV38G160C9K 8GB Memory Module Kit - DDR3, 1600MHz, 240 Pin, XMP 1.3, RoHS Compliant
-[GRAPHICS CARD] E145-0667 ::EVGA GeForce GTX 660 02G-P4-2662-KR Video Card - 2GB GDDR5, PCI-Express 3.0(x16), 1x Dual-link DVI-I, 1x Dual-link DVI-D, 1x DisplayPort, 1x HDMI, DirectX 11, SLI Ready, Superclocked, Dual-Slot

The upgrade will cost $587.96. Is the price decent for the improvements?