Stay away from Vortex at all cost, "IF YOU CAN"
Get Filco only if you tend to be "modding" in the future via "soldering"... Otherwise the improved PCB doesn't do anything for you..
If you have no intention of ever modding the keyboard, then go with the Quick Fire Rapid... It's $65 for the MX Blue, and you can get a set of choice Color PBT with the left over funds from anywhere.