Seeing what is on the web and knowing the market are completely unrelated. There´s research and well, there´s guesswork.
Now, are you buying a 135 shuttle or airliner, 145 shuttle or airliner or Legacy 600?
Do you know what you want or are you unsure of the correct designation of the Legacy 600?
I suspect you haven´t purchased before because you wouldn´t be on here pressing the flesh! In which case, you shouldn´t be making these decisions.
Good luck. You might need it.