I've just bought a new microwave based on the Which best buys (scored 81%). Its the Panasonic NN-ST477SBPQ. Its quite large, stainless steel and seems to be pretty good, although pretty noisey!
From the Which Guide "This Best Buy Panasonic microwave has lots to recommend it - not least a string of great results in our main reheating and defrosting tests.
In particular, this is one of the best microwaves for manual defrosting, and unlike many models, defrost settings recommended by the manufacturer work well.
There's a good range of functions, including a turbo reheat mode that zaps extra power for reheating liquidy foods, delayed-start programs and the 'multi stage' program that lets you vary the power settings over specified durations without interrupting the cooking.
On the down side, we weren't impressed with the quality of the jacket potato and were surprised to note below-par results for cooking several meals in succession.
When it comes to ease of use, this microwave has a mixture of good and bad points. Our experts felt the controls are cluttered and too close together - meaning you have to peer at several buttons to make sure you choose correctly, so it's an unwise choice if you have poor vision.
To compensate, it does have an electronic 'demo mode' to help you get to grips with programming, and the electronic panel helpfully displays 'open door' when the meal is ready.
There's a trim kit availalbe (NNTKV63MB) if you want to build this model into your kitchen.
Pros: Very good at reheating single items, both defrost options work well
Cons: Disappointing results for jacket potato, didnt cope well when reheating several meals consecutively"