So I've been playing with the thought of getting a RME babyface pro and using it as my main interface to cut latency down and improve stability. I also have a presonus 192. Is it possible to inter face the 192 into the RME via adat so I still have a good amount of channels? Thanks

Make sure both audio interfaces are running off the same digital-clock (one master, the other the slave).
At that point, the 192 is simply acting as A/D (feeding the Babyface).  It'll work just fine.

Can this be done with asio drivers, and firewire 800/usb?

Yes, because you're actually only using one ASIO audio interface in your DAW application.
The second interface is merely acting as A/D (sending audio digitally via lightpipe to the main audio interface).

Here's a great question, from a latency standpoint would the babyface have less then the 192 (in general)? For use with sonar and studio one , This is what I've been told by some salespeople however I trust this community more so.

Yes, The Babyface Pro will have lower round-trip latency than the 192.
 
Note that the newer Presonus Quantum (Thunderbolt) audio interfaces offer extremely low round-trip latency.

If only PCs had a good solution for the Thunderbolt connection. I purchased my new PC with a motherboard that supports Thunderbolt however finding the hardware addon has been less than easy. The manufacturer rep indicated I needed to purchases it from a 3rd party with no clear direction on what worked with my motherboard. Plus I've heard the whole PC Thunderbolt addon has had many issues. At least it sounds like the babyface or any RME product would offer lower RTL and have better stability. thanks 

FWIW, Thunderbolt-3 on PC works well.
I'm using a UA Apollo-8 and Satellite expander (via Thunderbolt-3).
Rock-solid...
 
For Thunderbolt-3 on a PC, you need the following:
Motherboard that has a Thunderbolt-3 header (the BIOS has to specifically support Thunderbolt-3)
Thunderbolt-3 "add-in-card" that was made for use with the motherboard
Up-to-date install of Win10
The audio interface has to have PC drivers that support "PCIe via Thunderbolt"
Thunderbolt-3 to Thunderbolt-2 adapter
 
Note that Microsoft doesn't support "PCIe via Thunderbolt" with Thunderbolt-2 controllers.

Thank you so much for the insight. So here's another question what other usb audio interfaces (in general) would offer lower latency then the 192?

Any of the RME or MOTU USB audio interfaces would offer lower round-trip latency than the 192.
Sub 5ms total round-trip latency...