I want to see how future proof this CPU would be for me. Also would it be noticeable at 1360x768?
There is no such thing as future proofing in the computer (and really anything with technology) world. If lets say you got an I5 now in about 12 to 18 months it will be "old" because Ivy Bridge E will be out. As for gaming with a Pentium G, it can handle most games just fine. What games are you playing at at what resolutions.
No your CPU will not bottleneck the GTX 650 TI at all, for your processor you experience bottlenecking when you go past an ATI HD 6870 or the Nvidia equivalent. Also about your resolution in your games if its at 1360x768 you should be able to max out a lot of games.