Sounds interesting. Hope some good info comes back.
I was thinking along similar lines yesterday and thought: if I was to start over seeking out wildlife in Europe / WP, I would aim for quality not quantity.
So I would search for the rarest, most elusive species like Rock Partridge, Bonelli's Eagles, Eagle Owl, Baillon's Crake, probably lots of better examples, in the assumption that the commoner species would all fall whilst looking for the rarer ones!
As it happens, I spent my "youth" getting big totals, but still haven't seen some of the harder species. Having said that, I could have spent my youth looking for Rock Partridge and Baillon's Crake and have a much shorter list by now, still with no Rock Partridge or Baillon's Crake!
One tip I would have is to aim for the corners and extremes of the area you are interested in. Trips to Israel, Finland, Morrocco, Armenia perhaps, then find out which times of year are best for these species. (usually when the tour groups go out there!)
Hope this helps,
Peter