get a mantis - easily portable - I've travelled a lot with mine on planes (perfectly sized for hand lugggage), trains and buses and used to live on the 2nd floor (or 3rd if you're american) with no lift... and that's with just the standard tiptop case - there's a 3rd party briefcase that's more rugged if you're worried about it!

then you'll have plenty of space to add modules without sacrificing others - at least until the mantis is full!

"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