Some very rough rounded figures,
Seneca II $250-$300ph + 100lph 160 TAS MTOW 2070kg BEW 1250-1450kg (ZFW limit)
Baron 58 $300-$350ph + 130lph 180 TAS MTOW 2450kg BEW 1550-1700kg
Navajo $400-$450ph + 150lph 175 TAS MTOW 3100kg BEW 1900-2100kg (ZFW limit)
Chieftain $450-$500 + 170lph 175 TAS MTOW 3250kg BEW 2000-2200kg
Max weights and zero fuel weights can all be dependent on vortex generator kits and specific models. The figures are for a working aircraft doing moderate hours a year and can vary greatly also depending on how much you pay for parts, maintenance and yearly utilisation.