Trade up to a new Canon EF 70-200mm f/2.8L IS?

[ThatEOSGuy]

Gang,

A brand new member here.  Thanks in advance for your opinions on this.  

I have a first-generation EF 70-200mm f/2.8L IS bought new in 2007.  

Just back from CPS with a full clean and check.  They pronounced it in excellent shape.  There is not a ding or scratch on it.

Would it be wise to sell it for a second-generation (EF 70-200mm f/2.8L IS II) model?

And if so, what do you think I might expect to get for the first-gen model?

Thanks again in advance!

[ebiggs1]

I would, I did.  That is just me but the version II is fantastic.

If you have everything, including the box, $800 for a quick sale. $900 if you hold out and it is in great shape.