Do you know the DOCs for those aircraft? Depending on the type they are slightly below or slightly above 1400/1500 euros. If you really want good and "reliable operators and a price excluding unforseen costs" you should probably increase your offer by 50%-100%.
I have done some calculations on the Phenom 100 recently. I based my calculations on a fully loaded brand new aircraft, being readily available with 4 sim-trained and decently paid pilots. Fuel burn was for an average sector of 01:15. Based on those numbers every single operator with elementary school maths skills would rather have it sit on a ramp than making 1500 euros an hour.
I just did a very quick estimate based on a used Phenom 100 purchased at an average price and longer sectors. Any price below 2000 euros would make me run away from that operator! PrivateFly is quoting an average price of 2075 euros. That should be indicating the lower end of the market, because they are selling lots of empty sectors.