Reddit mentions of midiplus, Key Midi Controller (Origin 62)

I recently impulsively bought a Roland JD-Xi, as my first ever synth and music instrument in general, at Guitar Center after visiting and seeing it was $100 off. There's a 45 day return policy so I'm can always get my money back if I end up regretting my purchase, though I'm enjoying it so far.

However, I'm itching to practice playing the keyboard itself, so that I can both play songs I know and also create more interesting tracks on my synth, but I'm finding the 37 mini-key keyboard on the JD-Xi to be a bit limiting. I'm considering buying a separate 61 key MIDI controller and connecting it to my JD-Xi, and putting them both on some two-tier stand.

Does this seem like a waste to have the JD-Xi then? Would I be better off getting the MIDI controller and a synth with a smaller/no keyboard that's cheaper? The 4-track pattern sequencer is one of my favorite aspects of the JD-Xi, and I don't really see another synth with something similar.

Or, rather, would getting a separate MIDI controller help me bring out the most of the JD-Xi?

Also, in terms of controllers, I'm not looking to spend a ton since I just spent a decent amount on the synth, just a basic velocity sensitive 61 key keyboard with MIDI out, and possibly some knobs that can be assigned to control some of the menu parameters for the JD-Xi. Here's some of the ones I found:

midiplus i61 [$84] Pretty basic

midiplus Origin 62 [$126] Has a bunch of knobs and such that I can use for the synth, but apparently the velocity sensing is mediocre

Nektar Impact GX61 [$120] Pretty good reviews, has some MIDI assignable buttons. I'm assuming it has 5 prong MIDI out, but it's hard to tell from the picture.

M-Audio Oxygen Series 61 [$120] Seems decent all around, but again, it doesn't look like it has a 5 prong MIDI out, just a USB.

Any suggestions?