personally I would try to keep functionality as separate as possible
so if in 6 months you decide you hate the quantizer, or just don't need it, you can swap that and still have the matrix mixer - plus I don't know if you can use CVilization as 2 things at once, which you will probably want with these 2 functions
AISynthesis, doepfer would be the matrix mixers I would recommend most - doepfer for ergonomics and price, AI for size
the only thing I've seen that I would combine would be vcas - but that starts getting quite expensive and big (4msVCAM)
do you already have a mixer? - if so I would try to do without the XOH - I tend to find output modules to be superfluous - unless you absolutely need balanced outputs or headphones - if you only need headphones - get a headphone only module! - otherwise a smallish external mixer (10-12 channels) is probably a better buy than an in rack mixer
"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