Depends on what you're planning to do with it and how many hours a year you plan to fly with it. The 505 is overall much more powerful aircraft, much more safe (easier auto-rotations, latest crashworthy standards, etc), provides a lot more visibility, a lot more comfortable for everyone, and the flat floor provides a lot of flexibility inside.
But, you've owned 206s forever so you know what you're doing with them. if you're only flying 50 hours a year for fun.... get the 206 if looks are that much more important to you. For every other reason, you should get the 505.
My recommendation is getting a demo... you'll love it or leave it in one flight based on all your 206 experience.