seems like you have thought of everything you need in a complete startout-system.
i see vco's, vca's, filter, mod sources and a sequencer so that will make sounds for sure =)
the only advice i can give you is start as small as you can (module wise, a big case is nice ;D) and then let your system guide you to the next modules.
maybe you an use my little starter rig i am currently building as an inspiration:
i tried to fit as much basic features as possible into a 2x104HP makenoise skiff.
my plan is to get this finished and then get a big ass studio case and expand from there ;)