Personally, I would sell the 80 last and the 150 first. However, this is just me. The normal lens is the most important lens for me. I also like a moderate wide like the 60mm quite a lot. When I use a telephoto on square format, I generally like to use ones longer than 150mm (e.g. 180 and 250), so I would probably sell the 150 first, planning on getting a 250 some time in the future.