I'd spend the extra few quid and get a real rings - you don't save that much space with the nano version (or money)
and due to the number of jacks even the full size one can feel a little cramped - also it's notoriously difficult to 'tune' perfectly and trimmers, at least in my experience, are much less accurate
"some of the best base-level info to remember can be found in Jim's sigfile" @Lugia
Utility modules are the dull polish that makes the shiny modules actually shine!!!
sound sources < sound modifiers < modulation sources < utilities