Rather than planning it all out in advance, the best strat is often to get something like a 0-coast and a key step and then think about what you want to do that you cant do with that. You'll otherwise spend hours trying to pick modules based not on what you do need but on what you think you need.
Alternatively, get a key step and something like plaits (lots of tones with a built in vca), maths (envelopes, lfos, utilities) and warps (with parasites installed). Then worry about what else to get later -- e.g. if you always use the delay in Warps, get a delay...