Not sure how far you can get with that budget, it may make more sense to stay in the software realm, which also has a few benefits over hardware (no I/O issues, total recall, instancing). You may easily end up editing things on the computer anyway. If you miss the hands-on, probably buy one or two MIDI controllers instead.
Hw or Sw, I´d say you would probably benefit more from FX than standard modules (although you still need a few of those). Maybe look for some purpose built tools like zynaptic wormhole or go "modular fx" with BIOME and the like.
If it has to be eurorack hardware, zoia euroburo comes to mind, but it wouldn´t be me first choice in the given scenario.