The 7xe is the newer model referred to as the "evolution". They typically are listed on Audiogon for $1600 to $2000. There is one for sale now that is $2200 and two others for $1900 (sold) and $1775. My thought is that a warranty is better than no warranty all else being equal.
I've heard the Naim 5x and 5i and felt that there was not nearly enough of a difference to justify the higher cost of the 5x unless you plan to add a Naim power supply which can't be done with the 5i. To me the Meridians have a different sound sig from the Ayre. In the end, it's the OP's ears that must like the cdp. Best bet is to try to audition as many as you can or just take the plunge in the used market knowing you are likely not lose much if you sell to try something else.
For context, on purchase of my CD5i I demo'd versus CD5x, Arcam CD192 Diva, Meridian G07, Cyrus CD8x.