I agree crisp white and a change of handles would look great. Also a industrial grey would look amazing, especically with the exposed hardware. Obviously this all depends on the rest of your kitchen but you could be more extreme and apply something cheap like chipboard to the back and apply some fun wallpaper to make more of a feature of all the items that you will have on display.

Dear Azfar, I think your units are lovely, very sophisticated and much nicer than white. Your units and work tops are very similar to those I have in my kitchen, which also have black granite tops. I also have a wooden floor of a similar shade, please don't change this, it is lovely. I was aware when I had my kitchen fitted that the units appeared darker than in the showroom but this was due entirely to the colour of the walls they were installed on. To lift the units, and celebrate their beautiful colour, you should paint your walls a darker and contrasting colour, I have chosen a really shocking pink, Rock Candy, but there lots of options. The showroom I saw my units in used a burgundy colour, too dark for my Victorian kitchen. There are so many colour options which don't have to be expensive, play around with a few tester pots and see which you prefer. This is by far the cheapest option, and I'm sure you'll fall in love with your kitchen units again once your units are allowed to stand out. Incidentally your unit colour helps to visually integrate your stainless steel 'fridge, another reason to stick with it. If you want to add units in the future you could pick up on your new wall colour for a very stylish look.

I think the answer is, it depends... On what sort of cooking you do; how much pain you feel if you see a grease spot; what sort of things you want to put on the shelf and whether you will replace them often. Of course, you could just put glass doors, although the effect won't be the same. I applaud your choice of matt cabinet finish - super shiny finishes are such a pain to keep looking good.

You're really looking at either a hi end kitchen company who supply a more traditional style kitchen ie inframe, or as @Daisy England says, go to an independent, but as you're planning on having this sitting on your worktop, depending on the design of the rest of the kitchen ie if you have towers, the counter level bi fold doors would be to a special size (as most tall doors are designed for tower use). The easiest way to do this would be to have an extra wide larder (800 or 900), fit an internal drawer unit at the bottom, then a piece of worktop, have power points inside and 2 or 3 shelves above. Depending on where the doors come from it may 2x 1965 doors or 2x 1245 doors at the top and 2x 715 doors at the bottom, all standard stuff. Bearing in mind the appliances your trying to hide would be too big to fit inside a 'standard' 300 deep dresser type unit, the counter top option might not be the most suitable. But for a budget of 20K, i could design and supply a larger than average kitchen that has some bespoke made to measure doors and specially designed rigid cabinets and all to a high spec.