Help! upgrading my PC Desktop

[xxprices503xx]

My specs
Intel(R) Pentium(R) CPU G2020 @ 2.90GHz
Motherboard: mahobay
Ram: 4gb
GPU:Galaxy GeForce 650 ti boost 2gb
PSU: CORSAIR CXM series CX600M 600W
1Tb HDD
Windows 8.1

I'm so so with computer and need help with upgrading. I was think of uping to a new CPU, Motherboard and case. So I would like thoughts on the below or other suggestions please. Spending limit to $300 or maybe a little more.

Intel Core i3-4130 Haswell 3.4GHz LGA 1150 54W Dual-Core Desktop Processor Intel HD Graphics 4400
http://www.newegg.com/Product/Product.aspx?Item=N82E16819116946

MSI Z87-G45 Gaming LGA 1150 Intel Z87 HDMI SATA 6Gb/s USB 3.0 ATX Pro Gaming with Killer Networking & Sound Blaster Intel Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130693

CM Storm Enforcer - Gaming Mid Tower Computer Case with USB 3.0 and Water Cooling Support
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119240

 

[STACKS ON DECK]

cooler master n600 is more functional then enforcer . . and stick with intel. good to go

 

[xxprices503xx]

@STACKS ON DECK My Intel CPU or Intel brand products?

 

[STACKS ON DECK]

@STACKS ON DECK My Intel CPU or Intel brand products?

board and processor . . intel is good at gaming . . .