In my opinion, the CoolerMaster QuickFire Rapid is the best Mechanical Keyboard out there for the money. It's almost identical to the FILCO Majestouch Tenkeyless, and by "identical" I mean the only perceptible differences between the Majestouch and the QuickFire Rapid are the branding on the back side of the keyboard, and the font used on the keycaps. Aside from that, they both use the exact same OEM (this is what makes the QuickFire Rapid such a bargain).
There is some info out there that suggests the FILCO is built to a slightly higher quality standard than the QuickFire Rapid (e.g. a guy on YouTube did a comparison between the two, and found that the FILCO uses a slightly different PCB with cleaner / more consistent soldering).
It really comes down to what your budget is, and whether the small differences I highlighted are worth the $50-$60 premium the FILCO demands.
Anyway, I own both a QuickFire Rapid and a FILCO MajesTouch Ninja TenKeyless (both with blue switches) and can't tell the two apart without looking.
To the best of my knowledge, only the standard QuickFire Rapid uses Costar as its OEM (i.e. will be essentially the same as a MajesTouch), so If you do go with the QuickFire Rapid, just make sure you get the basic model, and not the Rapid-i, Rapid-Si / one of the other QuickFire models.
Edited by ShoehornHands - 1/21/16 at 5:36pm