Cayenne Diesel… does the vehicle still make sense now?

Hello guys, first Merry Christmas !!!!!! had until recently a Cayenne V6 built in 2006.. with beautiful 22″ rims .. The vehicle is now gone and I am currently driving an E350 CDI coupé in black with natural beige leather. Think now again about changing to the Cayenne or a similar SUV… The question is whether it is worth buying a Cayenne diesel for 60,000 euros now, since in a few months the new one will come… Will the loss of value be extreme.. wa s you would recommend… Alternatively would be an X6 3.5d .. Ride currently about 30000 KM a year and therefore a diesel would not be bad. The Cayenne Diesel which I have seen costs 61,000 euros in white with fullheath in black. Alternatively there was at our dealer another one in black with beige leather… with the usual equipment both have the air suspension (had unfortunately not missed in our old). Greeting from Stuttgart Aj