767-300 Base Pack = 39.99 Euros
707-300 Base Pack = 29.99 Euros (a long time special down from 59.95)
767-200 Expansion = 9.99 Euros

Looking at the current prices above, you save the most (30 Eros) by buying the 767-300 Base Pack.
But...IF you already own the 767-300 Base Pack and so are only wanting the 767-200 Expansion model, its usual price is already 9.99 Euros so you save nothing buying it during the sale.
Then there is the normal price for the 707-300 Case Pack, 29.99 Euros, so you will save 20 Euros if you buy that.

The decision is yours. I hope Captain Sim don't mind me telling you where you will get the best bargain. :D

Mark