Yes, evaluate how many inputs you may need at any given time.
If you do plan to use all 8 inputs, something to note;
The 4 inputs on the front have obvious physical volume controls.
The 4 on the back do not.
Just one of the variations with this unit.
So for using it as a live mixer (as Matt suggested) it would be a 4 channel mixer effectively.
One cool thing a lot of users like is that the dial lights up different colors to show signal level.
But that's pretty much what you get for meters.
I was considering this unit (needed 8 inputs) but decided that having the dials available for all 8 inputs on the front panel was a huge plus.
Then also having a more conventional graph display of all 8 inputs (as opposed to the 4 front dials lighting up and having to launch software to get at the other 4 on the back) made it much better for actual recording use, and now all 8 tracks can be used in a live mixer situation if needed.
This made me take the plunge for the next unit up.
So I went 18i20.
Of course it's your call. I don't know if you'd ever need the extra stuff.
I did.