I'd go bigger at least a 6u/104hp case - unless you are going to keep your existing case too
this way you'll have a bit of space left over for future expansion and don't find yourself in the same situation (swapping modules in and out) in a few months or so
how are you recording?
what are you using for mults?
there's a decent selection of utilities, but I'd probably want a matrix mixer (really useful for a number of things) - I'd probably also consider replacing the contour and function with maths (more than the sum of it's parts - see the 'maths illustrated supplement') and also consider adding an fx aid (xl) as it adds an amazing number of effects etc in a small and relatively inexpensive package
"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