- N64 can be modded to be play JP games (literally just remove a couple pieces of plastic near the cartridge slot, easy to do), you can dump the rest
- Wii/WiiU is region free when softmodded (easy to do), dump any spares
- sell the spare GBA/SPs, up to you if you care to bother to use it with analogue pocket out there now
- 3DS is region free when softmodded (easy to do), you can dump any extras especially now that eshop is dead.
- DS is region free regardless, no way you're ever gonna use a fat DS
- dump the normie switch
- trash any dead 360s, they dont really have much value, not much interest in hacking them that i've seen since its not entirely easy to do
- the PS2s can be useful, not really an easy mod for them though. leave this up to you
- PS3 is region free so you could dump the JP unit
- PSP is also region free so you could dump the JP unit
- xbox can be region free if you decide to mod it (softmod etc), even a JP model can be useful to anyone who wants to mod it
- dump the hd-dvd drive, thats just wasting space
when i say "trash" i say just dump them off at a gaming store. see if they'll accept them, if not just say they are going to the trash anyway and leave them there and run away.
you can gain so much space dumping those extra consoles. probably make some money too considering 3DS hardware are HOT right now