I wouldn't buy the rapid tenkeyless... I heard that one has some problems. I also think it doesn't have USB NKRO if I remember correctly
I don't know about the other ones, but I can say that I am very happy with CM Storm Quickfire Pro. I also don't know about the XT, I only know about rapid and pro.
here: http://www.amazon.com/CM-Storm-QuickFire-Pro-Mechanical/dp/B007VDOOBU/ref=sr_1_27?ie=UTF8&qid=1390330418&sr=8-27&keywords=cm+quick+fire+pro
The partial lit keys look kinda stupid though, thankfully you can disable them (or go for ultimate)
I don't know about the other ones, but I can say that I am very happy with CM Storm Quickfire Pro. I also don't know about the XT, I only know about rapid and pro.
here: http://www.amazon.com/CM-Storm-QuickFire-Pro-Mechanical/dp/B007VDOOBU/ref=sr_1_27?ie=UTF8&qid=1390330418&sr=8-27&keywords=cm+quick+fire+pro
The partial lit keys look kinda stupid though, thankfully you can disable them (or go for ultimate)