First time building a computer!

M1kss

Honorable
Jan 4, 2014
1
0
10,510
CPU: Intel Core i3-4130 3.4GHz Dual-Core Processor ($118.93 @ OutletPC)
Motherboard: MSI H81M-P33 Micro ATX LGA1150 Motherboard ($48.98 @ OutletPC)
Memory: G.Skill Ares Series 8GB (2 x 4GB) DDR3-1600 Memory ($64.99 @ Newegg)
Storage: I would use it from my old computer - 640 gb
Video Card: EVGA GeForce GTX 750 Ti 2GB Video Card ($149.99 @ NCIX US)
Case: NZXT Source 210 (Black) ATX Mid Tower Case ($29.99 @ Newegg)
Power Supply: I would use it from my old computer - Coolermaster 620W
Optical Drive: I would use it from my old computer

I wonder now - it makes a big diference if I use those three parts from my old rig? This computer will be mainly for new MMORPGS I would like to play them on high or at least mid. You guys think the cpu is strong enough for that or should I use i5? Maybe some other recomendation?

Thanks!