As was said previously, it is very subjective. However, if you stick to the well known brands, you should be ok. Sidi, Alpinestars, Gaerne, Prexport are all nice boots.
What you should do is make sure you try each boot on before deciding which one to buy. I ordered the Sidi Vertebra's and there was no way I was comfortable. The top of my feet kept getting pinched by the boot. Maybe I have high arches? Anyway, as much as I wanted to keep them, I couldn't go with Sidi.
Beware of some Alpinestars if you have big calves. Their SMX boot which is probably their most popular has no calf adjustment so if your calves are big, they won't fit.