No they will be fine together, I wouldn't put in anything more powerful than the 270X though. Make sure you get a separate cooler like the Coolermaster Hyper Evo 212 for that x4 760K and some nice fast (1600 or 1866) RAM
EDIT, there may be a bit of a bottleneck if you don't overclock the x4 760K a little. Have you considered a Pentium G3258 instead? You can overclock it and upgrade to an i5 chip later using the same motherboard.