Looking at the 200s with Scottish starts I'd pick:
Eilean Dubh - Facilities at start and finish, 2 café controls (doesn't mention what the control is at Cromarty), <1%
Monster Munch - Again good facilities start and finish, good route even in the snow last year... and also not too hilly
Rothes Reccie - Newtonmore Grill's a good start/finish, surprisingly fast and flatish except for Brig O' Brown, that hurts...
Long Dark Tea Time of an Audax Soul - Relativley gentle out and back from Gala, good community centre start/finish; Snow Hare is another Gala contender.
Oddly that's also the gentlest 4, anyone wanting to start with some climbing would look at ARgyll Alps, Bens, Glens etc. and Deelechtable.
I'll also note that the Selkirk rides are good routes but X rated so not necessarily beginner ideal. And I've never managed the Hawick or Huntly ones.