I have the same problem as you.
I'm looking for an optical preamp to pair with my Studio 192 interface. The problem is that for obvious reasons it's not going to have the same functionality and connectivity as the Digimax DP88 would.
I've been buzzing about pairing it with Focusrite's Scarlett OctoPre for a while now, even though it's not exactly cheap.
What do you think?
And, folks at PreSonus, if you read this, bring the DP88 back to life or build an alternative, please!