"If Pat doesn't mind..  (it's all Presonus relevant)"
Not at all - please keep it going, I am learning a lot and thanks!

I was actually looking at the 192 online.  Looks nice, but I like to have 16 channels going at 88K sample rate.  Based on what I read, that would be the 192 with 2 D88s attached.  That is:
192 - $899
D88 - $499
D88 - $499
___________
$1897 - Too stiff for my pocket book. 
That is why I was looking at the RM16, I may have to settle for 2 FireStudio Projects and Keep my Mackie 1640 (with Firewire) for live stuff.
 
 

I just found a pic that shows quite well how I deal with the lack of line inputs and also multiple headphones...  if you're interested.
 
Pic shows RM32,  Proel DI box (2 in that rack slot, so 4 channels), Headphone amp with custom cable.

patm300e
I was actually looking at the 192 online.  Looks nice, but I like to have 16 channels going at 88K sample rate.  Based on what I read, that would be the 192 with 2 D88s attached.  That is:
192 - $899
D88 - $499
D88 - $499
___________
$1897 - Too stiff for my pocket book. 
That is why I was looking at the RM16, I may have to settle for 2 FireStudio Projects and Keep my Mackie 1640 (with Firewire) for live stuff.
 
 

You'd only need one D88 to get 16 channels total.

Nope you need 2 D-88s if you want sample rate > 48K. (From the D88 manual page 5):
 
"ADAT – S/MUX Input and Output. These are the ADAT – Dual S/MUX connections to connect your DigiMax DP88 to your audio interface. When the sample rate is set to 44.1 or 48 kHz, only the ADAT 1 input and output will function. When set to 88.2 or 96 kHz, each connection will provide four of the available eight channels:"

That means a single ADAT cable/wire/pipe/connect can pass either 8 channels @ 48k  or  4 channels @ 96k
 
The DP88 has TWO pairs of ADAT.  For 48k use only pair 1 is used,  for 96k both pairs are used.
 
As the 192 also only has 2 pairs of ADAT, you can either connect 2 DP88 @48k to give 24 channels OR just 1 DP88 @96k to get a max 16 channels.
 
It's exactly the same with the old FireStudio26x26 and DigimaxFS (which I have)

Oh, so I would only need 1 192 and 1 D88.  Thanks for clarifying that!
Well at least that would save $499. So $1398.  Which is why I was looking at the RM16.  It is currently $1199 at Sweetwater!
 
 

If you want it for live, go with the RM16
If you want it for your studio, go with a 192 + DP88

I want both!  I used to do a lot of Live recording, now I am just tinkering with studio.  I may get back into Live again though.  It was fun.

ok,  the RM will work just fine in the studio (given the line level limitations which can be worked around), but I'm not sure I'd want to take the 192 + DP88 out live...
 
Does that help?