Hi,
the 60 and 45 models should be considered here, the 31 has a quite old philosophy..but I understand the one who are considering this lear..
For me the best average will be the 45 , perfos, fuel burn, qualified for steep approachs, APU (bleed + elec) a very nice avionics uptodate pacquage and really a nice airplane to handle.. for 12 million $ a great choice....