Well, the UPSAT MX20 costs about $6,000 and the ARNAV lists for about $13,000. Based on the UPSAT web site and Aviation Consumer, the MX20 can do just about everything the ARNAV can do, except engine monitoring and mayabe WX uplink at this time.
OOOPs, the ARNAV can’t do those in the Cirruses either!!!
The MX20 has VFR, IFR and Approach chart capability. I do not know the cost or availability of those databases. Now getting paper out of the cockpit WOULD really be an advance! The screen is a 6" diagonal and it looks great.
Other thoughts: I do not think the cost of upgrading to the GARMIN 530 is worth it if you have another display. In the case of the SR22, you have 2 others - the ARNAV MFD (or its replacement) and the Sandel.
The position of the Garmins also make them a poor choice for primary refernece, especially in IMC.
I will try to talk the the factory this week and see if they want to work with me on this one.