Hi Illlumen,
Welcome to modular :-) Did you already both some of the modules? If not yet, you might want to take it easy here. Since you got already a Peak and an OP-1 with a Bass Station too, there is no need to hurry here. You might want to re-considery our choice on the Harmonic Oscillator unless you felt in serious love with it (did you tested it at a dealer?) because it's a large module and looking at the small rack you have, space is something you don't have or at least you should keep in mind your limited HP-space.
I don't have experiences with those modules you mentioned, so I can't comment on them in details, just take it easy and please consider a larger rack. Did you checked out the Intellijel 7U case, 2 * 104 HP? That might be nice to start with.
Good luck with the planning and kind regards, Garfield Modular.
For review reports of Eurorack modules, please refer to https://garfieldmodular.net/ for PDF formatted downloads