As everyone has said, TIME bikes are very special in terms of ride, quality, and beauty. You will not be disappointed with the purchase.
Going into a little of what the differences are between the NX collection, hope this helps
The NXRS is TIME flagship race frame in the NX lineup. It has a ton of features that trickle-down from the ZXRS, as in the Powerlink asymmetrical chain stays (non-drive side stay is visual larger), CMT dropouts, and Translink seatpost (integrated).
NXS will have the wishbone stays and a little longer wheel base for a more comfortable/forgiving ride. Also goes to a standard seat post (aero). More like a Fluidity but with their racing geometry and a stiffer front end.
Last but not least, the NX will be a NXRS with standard chain stays, non-CMT dropouts, and standard seat post (areo) - all in a more compliant package.