What's your budget? I've never heard of any of those bands but I just gave them a listen.
They are heavily into Analog and Virtual Analog Synthesis and that gear don't come cheap.
A couple of suggestions to get you started without blowing your bankroll include...
Behringer Deepmind 6
Deepmind 12
Waldorf Blofeld
Studiologic Sledge 2.0
These all sell under or around $1000 USD.
Then there's always the Modular Eurorack stuff.
Stuff like the Behringer Neutron or Model D or the soon to be released Crave.
There's also an SH-101 Clone from Behringer the MS-101.
You might also consider the Korg Minilogue or newer Minilogue XD or the budget Monologue.
Then there is the Korg Volca series which gives analog goodness for ghetto prices,
You'll find that you'll need more than one keyboard to record a real song or else you'll need a MIDI DAW Studio for your computer such as the free as in beer Cakewalk by Bandlab to record multitrack one track at a time.
The cloud platform where musicians and fans create music, collaborate, and engage with each other across the globe
www.bandlab.com
It's an expensive addiction once you get started, but it's cheaper and more fun than smoking crack in the bowery
Gary
