Another is my system powerful enough?

[Dinujan]

Just an update, I purchased a Z97 ASROCK board. It was on sale and cheaper than most Z87 boards.

But I ran into a problem with the video card. The original card is too thick.

I'm currently considering the following:
http://store.galaxytechus.com/GALAXY-GeForce-GTX-750-Ti-GC-Slim-2-GB-GDDR5-PCI-Express-30-DVIHDMIVGA-Graphics-CardbrbrBONUS-Low-profile-brackets-now-included-freebrbrFree-Gift-150-In-Game-for-Warface-Path-of-Exile-and-Heroes-of-Newerth_p_90.html
http://store.galaxytechus.com/GALAXY-GeForce-GTX-750-GC-Slim-1-GB-GDDR5-PCI-Express-30-DVIHDMIVGA-Graphics-CardbrbrBONUS-Low-profile-brackets-now-included-freebrbrFree-Gift-150-In-Game-for-Warface-Path-of-Exile-and-Heroes-of-Newerth_p_89.html

But the Ti is sold out. Would I notice a big difference if I go 1GB 750 instead of 2GB ti?