I think your benchtop material choice really depends on how both you and your husband live and what level of natural wear you are comfortable with showing. Natural wood benchtops to me are very similar to natural stone or stainless steel. The surfaces will naturally age and show use, scratches and imperfections much more than say a caesarstone if it's a high use area but some people love that look and it goes well with an industrial or natural style. My wife and I thought long and hard about it but realised we want the benchtop to look as new and clean each time as possible so opted back for caeserstone (Ocean Foam) which hid small stains and dust :)

I agree with the first comment. Check out the Maximum porcelain panels. Ice attached a photo I took of the slabs. Statuario is in the front and Calacutta is behind it. http://maximumaustralia.com/products/calacatta This is the Australian link to the product range and there are plenty of photos of it actually in use. In person the design looks less printed in my opinion than the Caesarstone, but everyone has different tastes and that should be respected.

An outstanding job with one of my preferred material.

it should be quite easy to change the size of the base cabinets to create knee space..usually about 30cms deep...i would expect a deeper counter would be the easiest (but a bigger piece of stone may be challenging and you might have to consider an alternative counter material) so consult a kitchen cabinet maker for specific advice and quotes and they should be able to reuse the existing sink, taps, doors and some or all of the cabinets for two options : a new smaller base cabinet or a deeper counter so ask for quotes on both options but first line up some chairs to decide if the bigger counter is comfortable in your room