Highline controller

Greetings folks...very happy owner of a (new to me) 2008 pre-FL Octy CR170 estate.

Completely different driving experience from my Civic Type R daily (which is now being converted into a weekend/track car).

The Octy comes with a Stream MP3 headunit, and no Maxidot, cruise control or MFSW.

I'm hoping to retrofit the full bhoona (MFSW, Maxidot and cruise) and then hope to get everything working with a yet to be purchased Android headunit. 

Considering I don't have any of the above, is there any point in identifying my steering column controller, as it will be a Lowline one anyway?

Can I essentially, just purchase any Highline controller? Or is there a specific one that will work with my Octy?

Also, does anyone have a rough idea on how much a Highline controller should/will cost? 

I ask because the ones I see on eBay are retailing for around £220...

Thanks in advance!