Used 192 "standard" should be around $300US and the Midas XL-48 should be around $900US. A 192 DIGITAL should be more like $200. You will need an old-style Digilink cable AND a Digilink to Mini digilink adapter(which might have been included with your OMNI) and a pair of BNC cables for the LOOP SYNC connections. Be prepared to fuss with the settings under the hardware menu to get the proper digital inputs working as its not exactly intuitive(once I got mine figured out and working, I save screen captures so I could restore quickly at a later date. Trashing prefs will reset this to default)