A non M is fine right now but you are buying into a technology dead end, either pony up for the M and have something that is going to take updates and be supported for a fair few years or get a cheap as chips stopgap until you can afford an M powered machine.
A non M is fine right now but you are buying into a technology dead end, either pony up for the M and have something that is going to take updates and be supported for a fair few years or get a cheap as chips stopgap until you can afford an M powered machine.