A pressurized twin is out of your price range. So is 160 KIAS at
cruising altitude. 1000 nm range will be iffy.

Assuming you really meant 160 KTAS at crusising altitude, the options
open up.

Starting bottom up in terms of operating cost, think Twin Comanche with
extended range tanks (tips or nacelle) and a Robertson kit. Typically
1400-1500 lbs useful load, about 100 gallons usable fuel (84 is
standard), and 160 KTAS at 7000-11000 ft on 15-16 gph total. Total
operating cost will be about $25K/year, all up (maintenance, fuel,
insurance, hangar, etc) and you can get a good one for $120K.

If you really need more load carrying, think Baron or C-310. Operating
cost goes up by 40% or so, payload goes up about the same, speed might
go up a few knots.

Michael