Well unfortunately its going to cost alot more money if you want it to be a live performing rig of some sort because you need additional sequencers, clocks, dividers, multipliers, envelopes, Quad VCA's and Mixers etc that you may not have needed otherwise in a studio just being a sound generator into the DAW.
The reason why the arps sound so good is because naturally hardware oscillators are more rich and lush compared to software and the hardware sequencers are really efficient to get results with while being hands on.
It looks like Colin is using the Intellijel Metropolis sequencer, I don't think its a arpeggiater module making it happen its something he has programmed himself into the sequencer.
You can just use plugins to process further without having to buy effects modules, but a good reverb and delay is always nice to have.
I bought Clouds for pads and drones aswell ;)