I'm intrigued by that Planet Granite solution! I thought you granite people always said that granite needs to be protected from direct heat and pan stands were necessary? Is it ok because it's being heated slowly from cold?
It depends what finishes you want Stoo, as to the best way of disguising your kitchen ... because, lets face it, it's never going to be invisible
If you go for a wood effect finish for any cabinetry (cherry, say) and black granite for the worktops (or have a look at Tim's sparkly black Prestige quartz) ... then that would look very smart. To my mind Corian would look more like kitchen worktop ... but that may just be me.
You could have a black, flush fitted, touch control, ceramic/induction hob which would be unobtrusive and you could go for an undermounted sink (or sinks) - and possibly get a quartz/granite shape to fit over it (with a hole in the centre for removing it). Alternatively get a black sink. The tap, though is going to be visible. Have a look at designer taps and choose one that, in your opinion, looks like a work of art and make a feature of it - there are some amazing ones around these days.
The appliances could also be black. Try stylish and smart - instead of invisible.
As to the spaces; if it's a working area, without people walking past, I try to make it a minimum of 900mm. If it's more of a thoroughfare, or you've got dishwasher or oven doors opening into it, I'd go for at least 1200mm.