Depends on what your criteria are. Do you want to use it to do trenching, for example...not all do it. The DW707 does not, as you know.
Dust extraction...how important is that to you. Some are much better than others.
Size....what's the maximum that you want to cut?
Do you just want to do mitres or do you do compound angles? Some have the scales facing the operator which makes adjustment much easier compared to grovelling around at the back.
Out of curiosity, why do you say your DW is inaccurate? I have one and seems reasonably accurate as far as I can see.
Lastly, size of stock ...how small do you want to cut mitres? For example, when doing beading for windows, it's way too small for my DW707 and so I use a homemade mitre block, Japanese hand saw and then tweak using the Axminster mitre guillotine.,,which is a very very very useful bit of kit.