for >=1080p I would give up on that low quality build and start over piece by piece as the money comes available. 750ti is a pretty low quality GPU these days.
if you are in a hurry to get it built then just go for it and upgrade as you get more money. but for modern games and those to come, running at 1080p with good settings and getting good frames per second i would suggest:
Z97 motherboard, good i5 CPU, at the very least DDR3 1600 RAM,
GPUs in order of quality: 970 or 290X, 390X, 980