Hmmm 'puts design guru's hat on!!'
Shaker will never be naff or dated since it is a classic, but I think it is a style best suited to larger kitchens - remember it comes from a traditional American style which usually suggests larger rooms.
Flat fronted cupboards are great (no fiddly corners for muck to settle, unlike Shaker) They are perhaps more 'of the moment' and could date more quickly, particularly with those long bar handles. However, great for smaller rooms.
Looking at your original post, the floor will be wood, that could work with either, but make sure that the colour matches the units to increase the sense of space if you go veneer fronted units.
So .... my solution!!
If you can, lose the wall cabinets, use under unit space if poss - bear in mind if you lose the kickboard the amount of gunk that will gather is disgusting and leads to loads more cleaning! A smaller range cooker would be great, 90cms at most would give you 2 decent sized ovns and at least 5 burners (I went for Rangemaster Toledo, sleek and modern, ut with a separate grill). Birch veneer flat front cabinets and matching floor, with darker worktop (go for a fake slatey formica). No tiles, try to get an upstand around teh worktop of the same material as the worktop. Pale creamy walls, loads of light via teh sky light and lots of chrome accessories!! Tada
Personally Iwould get teh best quality units you can, so if you do get bored the doors could be changed at a minimal cost.