I would not go with ESLs if you plan to mount the drivers in the wall!!
Instead I would get my hands on the most efficient and wide range speakers I could. ML ESLs are traditionally not very tube friendly and it sounds like you are on a budget so a high powered tube amp that will do the MLs justice is likely out of the picture.
Lowthers, PHY and other high efficiency drivers is where I would be looking (in my own case I would likely be looking at a 2-way system using 15" woofers of high efficiency so that I had full range; this would allow you to use a 5 or 6" driver for the mids and highs). This would allow you a lower powered (read: affordable) tube amplifier and the results could be really excellent.
Instead I would get my hands on the most efficient and wide range speakers I could. ML ESLs are traditionally not very tube friendly and it sounds like you are on a budget so a high powered tube amp that will do the MLs justice is likely out of the picture.
Lowthers, PHY and other high efficiency drivers is where I would be looking (in my own case I would likely be looking at a 2-way system using 15" woofers of high efficiency so that I had full range; this would allow you to use a 5 or 6" driver for the mids and highs). This would allow you a lower powered (read: affordable) tube amplifier and the results could be really excellent.