When I had my 20C I came from a Cherokee 140. To be honest if you do the math on time savings assuming you are flying 200 mile trips strictly from the point A to point B stand point the PA 28 would be the better deal considering price, insurance and maint. I found when you get out to 400 miles or more ( in our case it was 600 ) the 20C could not be beat. Insurance was around 250 a year higher on the Mooney. Annuals ran around 600 dollars more. As for the storm scope we had an old WX 8 and loved it. We did not have the XM weather so flying on a hazy day and knowing what was around you was good. We had a simple Century 1 AP and that really took a load off on a long trip so I imagime the STEC 30 would be a god send.
As for the engine being 0 SMOH you need to ask questions. Who did the OH. Is it a service limit special done in the hangar or was it a new limits with new accesories job done by a good shop. While the varisol OH looks good on paper in reality you might have been better with an over TBO engine from a good shop. My 20C was still going strong at 2300 SMOH where my friends PA 28 had already had a camshaft failure at 400 hours and a top OH at 600.
As for the bird being worth 62K I think it is high unless the engine OH was new limits, all accessories done from a reputible shop. Also the KLN 88 is dead weight now but you could add a KLN 90 or I believe a KLN 94 easily.
In the end if you are VFR like me all I want is a solid mid time 20C with a couple KX 175B's a KR 86 and maybe a DME and I will be happy for say 38K or so.