My best advice is to go for the 30" wall oven, at a comfortable height for reaching in with your forearms parallel with the floor. That will give you the best strength for reaching and lifting. The reason for 30" is it's the current standard, and the 27" ovens available are still sold as retrofits. I believe many are older models that they just keep making. If you're going to age in place, the last thing I'd think you'd want to do is remodel the kitchen again in 10 years if you need to replace the oven. Since you mentioned Bosch, I think you should really look at the side opening one. That will make it much easier to deal with if you have any future physical limitations. Agreed about not getting the combined unit. There are very few good reasons to do that. Relocating a few things that you need in the kitchen less often out of the kitchen proper is worth the bit of storage you give up with a slightly larger oven and separate microwave. Unless you go for the Advantium or something (and it doesn't sound like you're looking for the speed features on the Advantium), a regular microwave on a shelf or in a cubby would be a cost savings and work just as well. If the area has a couple of inches of "play" all around it'll make changing models easier too. It sounds like the real research you need is about the broiler. Did you use it for actual broiling? The broil grill in the Bosch (for example) ought to be adequate for that. Did you use it as a small oven? You might want to look at a countertop model like the Breville or Cuisinart as an alternative. Would the Advantium do for you what your small broiler does for being a small oven? (I haven't used the one with a broiler in it, but most of them in convection only ovens, which is what Advantium is when it's not a microwave or speed oven, are adequate for a little browning, but not like a full on oven broiler.) 8'x10' is a good sized kitchen. You should be able to fit everything you want in it.

Have you checked with manufacturers of RV's or mobile homes? They use small appliances and have many hints for using small spaces. Do you have space for a roll up dishwasher? Hooks up to the sink when in use and rolls over to the wall when not in use. Mother had a roll up/mobile dishwasher AND a roll up/mobil clothes washer in her kitchen....she couldn't add plumbing and this was the best way for her.

Its not really a gadget, but I just got a new chefs knife for my birthday. (I was actually given a paring knife, but it didn't match the rest of my knife set.) I went to the store it was from to see is they had the same handle style as my other set. They only had one of that type Henkel's 4 star, a paring knife that was identical to one I already had. It was also clear from the prices that the one I was given was a much higher quality than my existing knives. I hemmed and hawed about what to do, and finally decided to get the chef's knife from that higher quality set which was on a special loss-leader sale, at 59.99, just 10 dollars that the paring knife I had been given. The new knife is so insanely sharp. I knew my existing knives were somewhat dull, especially the chefs knife that I use most often, but the difference is startling. I know the old saying about a dull knife being more dangerous, because you have to use more force, but I'd say a sharp knife is much more dangerous, especially if you are used to less sharp ones.

Don't do white. Different brands are going to have different shades of white, and it will be especially noticeable against a white backsplash. If you're going for neutral, then choose stainless. Or choose a color family that will look good together in different shades (Iike the pic below). Try to find all of your appliances before you buy any of them so you can preview how they will look together. For example, I like the blue set Jan posted above, except I think the kitchenaid has the wrong undertone. But a stainless mixer would look awesome with those other things. I like how this person here added a pop of complimentary color with the yellow pots: