Yep, take it easy there!!
Start small and build as you learn is a much better approach, you will still make mistakes and that is okay, but they will be less expensive and less frustrating in the long run.
I would recommend that you still buy the big case and some blank panels, even cardboard will do in a pinch!
Then sort out ONE subtractive synth voice comprising: An oscillator, envelope, VCA, LFO, a filter and something to sequence it!
If you choose a complex oscillator you will also be able to create patches for FM synthesis.
You will be able to create every kind of sound on your list with just these few tools if you learn how to create these sounds from scratch.
You may be amazed at what is possible with just a few modules.
once you understand this, then add FX - I don't think it is a good idea when learning to drop reverb on everything, I would hold back and really listen to what is going on first. Okay okay... buy the reverb and have some fun, but don't skip these beginner lessons!
Once you feel like you have a good handle on this subtractive voice, you will realise what you need add to it to get where you want to be, so for example, you might want richer bass sounds, so you could add a wave folder, or you might realise that you want a source of random or different colours of noise and some FX.
Then finally start looking at specialist dedicated modules for specific tasks, e.g. dedicated drum modules and texture synthesisers.
Of course it's entirely up to you, but I never see people rushing out and buying a lot of exotic modules having too good a time in the long run, they always end up back at these first steps somewhere along their journey.
Good luck and have fun!
p.s. I am envious of your Pulsar-23 :D