To be honest - they are both pretty dominant for a 2.7 m stud - I like the idea of multiple hanging of similar lights. You could also purchase something less expensive and think about it until you find the perfect piece - sometimes we need to live in the zone before we see what it needs. One tip re budget - if someone walked towards you with $7000 in one hand and the light fitting in the other - which would you choose - a good temptation tester !

Ikea has very user friendly online planners where you can design your own cabinets and price all the parts..(NB also look at the non kitchen storage for suitable cabinetry..BILLY bookshelves with doors make great kitchen storage) big savings with DIY labour but the storage wall in your photo looks like you or a carpenter would need to custom make the wall OR you would need to use cabinets that don't reach the ceiling although we have some IKEA bookshelves that we plan to build in with a surrounding frame and line the gaps with wall lining which we expect to be a fraction of the cost of custom made

Depending on the tile you choose (rectified or not)- grout can get very dirty, yes it is hard and everything you drop will break and it can be cold in Winter (lovely in Summer). Timber is classic and warmer to walk on, 50% of things you drop will break (I'm being conservative- in terms of hardness there isn't a huge difference)....biggest drawback of timber is scratching- what people walk into your home, moving furniture, kids pushing toys around on floors, animal claws.

I know someone from Clarendon Homes and they talked about homes costing about $350k which was about $3000/m2. I know extensions in the city cost about $4000 with the high cost of tradies at the moment.