Last time I looked (1yr ago) the two main players were Garmin (G1000) and Avidyne.
Avidyne is on the Cirrus and Garmin seem to be on almost everything else.
The G1000 will accept inputs from a remote reading ADF and DME and this is how one satisfies the European requirements.
Avidyne could not at the time accept remote ADF/DME, which is why SR20/22 owners had the rather tacky retrofit done.
As for the rest, I can't say as I have never flown behind it. A recent review in the US "Flying" magazine does make the point that these panels do not give full FMS functionality; rather, they are basically a GNS530 with a bunch of the old engine/altimeter/etc instruments added.