Hi - having gone through this at great length recently, I can offer an opinion or two.
Looks like a lovely spec - a few thoughts on specifics
Roll out awning - there isn't one on your spec (the black tube on the side of the roof you see on many of them) - this is under £500 to add at the factory, but over £1200 to fit afterwards. Even if you buy it from the factory you can sell it for more than you paid on the day of collection!!
Bed Extension with Comfort Mattress - some people love this, others find it quite uncomfortable. If you don't buy it you can buy other bed mattresses/toppers for the same or less money that are much nicer. If there is only two of you, you can also just buy one that will do for upstairs and downstairs. For example, we've just bought a duvalay one for upstairs (which fits downstairs) for £108 at the NEC show.
If you are planning on driving in europe in winter - some countries require winter/all season tyres, so you could upgrade the tyres from the factory for not much money (c.£130) to all weather ones so you don't have to swap wheels later
80l fuel tank - it's peanuts to add and means you won't have to refuel as often. Remember the night heater uses diesel (not a huge amount) but it does affect how many miles you get out of a tank
Magnetic flashlight - peanuts to add and if you've got a dog or a dark campsite, is handy, always charged and easy to find when you need it. Another thing to not have to find a space for too.
Laminated Windows - we debated this but nearly everyone we spoke to who had had both said don't bother as the Cali is so quiet anyway. It is double glazed at the back anyway and the middle windows (the openers) aren't laminated if you buy this option anyway. It's only the two front windows. We just chose the privacy glass and saved a few quid.
LED Headlamps - functionally amazing, SO superior, and in our opinion make the van look 10x more modern too.
Does any of that help at all!?