There is lots of choice and I would suggest you speak to a specialist. The majority of installation speakers require 100mm of depth. You may want to check where the supporting struts are on the wall you wish to use as this may impact on the work involved.
We tend to favour the Dali Ikon in-walls, as they are a sealed unit so minimise any sound bleed and the ribbon tweeter delivers a wide sound stage. At different budget points we also use KEF and Tannoy with good success - the Tannoy Definition Install range in particular is very good if you are looking to invest in a high quality set up.