I think that this is the big question in Valencia (I bet even Cuper doesn't know yet

I also think that there won't be a "fixed" forward lineup. That is, I believe we will probably see a lot of combinations.
To directly answer your question though, I really can't say at this time, mainly because I have no idea what to make of Alonso and, to a lesser extent, Carew. They are the two unknowns (for me). Also, will Ilie be consistent? However, I know that I wouldn't start Sanchez (but Cuper seems to really like him).
We also have the issue of the 3 maximum "foreigners" (non-communitarians). We currently have 5: Djukic, Kily, Ilie, Alonso, and Zahovic. Only three of them can start (Kily and Alonso should get their Spanish citizenship sometime this season).
Now, we know Djukic will start. We also know that Kily will most probably start. That leaves one spot for Ilie, Alonso, and Zahovic. I'd think it would be safe to say that Zahovic will get the last spot (but again, like I said above, I don't know much about Alonso).
Depending on the tactics used, an Angulo-Zahovic front line would look good, or an Ilie-Zahovic, if Kily or Djukic can't play.
The good thing (and in some cases bad perhaps) is having so many options/combinations available. But regardless of the combination, it should be good one.
And don't get me started about our midfield

It's a monster!
I guess we'll know more of what is in Cuper's mind in the next two friendly games.
Ziad