Mesa 5i25/7i85S/7i76/7i84 combination?

Hi,
this is my first post here. So far I got a lot of useful information for my project from this forum. I’m working on a mill conversion since one year now and right now I’m at the point to decide, which mesa cards to use. And now I need help. So I think first I should try to give a short description:
The machine:
1982 Deckel FP 3A 3 axis mill
1 dc servo for 3 axis
3 linear glass scales
3 dc motors for automatic gear change
1 hydraulic system for tool and axis clamping
Coolant system
Central lubrication
The plan:
Since a few months I’m doing a complete mechanical overhaul, which is still in progress. I decided to mount 3 additional dc servos to get a 4 axis X/Y/Z/A mill. These dc servos worked already successfully with linuxcnc in a test installation, using UHU dc servo motor controller with step/dir inputs UHU servo
Moreover I want to use the existing glass scales (TTL level), automatic gear change, hydraulic system for tool and axis clamping, coolant system and central lubrication as listed above.
The specifications for the cards:
4 axis step/dir output
4 axis encoder input
2 spindle analog output (1 for the existing spindle motor, 1 for an optional high speed spindle)
1 spindel encoder
1 MPG handwheel encoder
1 RS-422 for I/O expansion
27 input
30 output

So I picked the following card combination:
5i25 7i85S 7i76 7i84
But there are still questions bothering me:
Are there other favorable card combinations?
What about the second spindle analog output?
What about the remaining 7i76’s 5 step/dir output, can these be used?

Thanks in advance

Dont know if thats optimum either There are other options for example:

5I23 FPGA CARD
7I52S 4 stepgens 2 PWM gens 6 encoders 2 PWM gens wired to 2X SPINX1 for analog spindle control
7I44 --> 7I84 X2

Thanks for your reply.
Great . I think this combination fits way better than 5i25 7i85S 7i76 7i84. I see several important advantages.
Existing firmware : I can use the existing 5i23_svst6_6_7i52s (which solves another problem of my 5i25 7i85S /7i76 idea)
Lots of I/O via 7i44: Up to 8 serially interfaced I/O cards (no firmware needed, if I understand aright)
And Spinx! I didn’t notice this at all, but exactly what I need.
Next step will be to look through the serially interfaced I/O cards for any options again.
Thank You!