I'm also eyeing the 1700X but I don't think you could cool a 95W cpu inside Sentry... Maybe getting 1700 non-X and overclocking it slightly until the temps reach 85C will be a better idea..
Running a 95W CPU currently with, according to my last test, 64C on the CPU in prime95. Cooling a 95W CPU is cake, putting it in a smaller case will still be well under 85C. I agree tho after reading more reviews on the 1700, it may be a good pick when over clocked to 4.0GHz; however, this OC completely up to the mITX mobos as folks are seeing the VRMs are getting very hot on the basic mobos.