I'm not really a "standardize" type person; I'd improvise, adjust & top-off whatever I had to hand!!
Originally Posted by Major Clanger
0 - 40m : Air diluent & 32% (dived this recently on a 36m wreck & in the pit/34m at Stoney )
40m+ - 55m : 15/29 diluent with 15/50 & 50% 
40m+ - 75m : 10/50 diluent with 15/50 & 50%
75m+ - 100m : 6/72 (possible 8/62 if at shallower end of range) diluent with 10/65 or 12/60 deep bailout., then.....
12/60 better OC bailout & can use SCR, but not that good to run unit from off-board (not good for flushing)
10/65 can cover bailout, SCR & able to use as a diluent via MAV 
Now it depends on how many cylinders your prepared to carry & dive set-up. A trimix travel gas to avoid HPNS then a deco nitrox mix (32% - 50%) depending on how brave you are!!
I've carried just 10/65 & 20/35 & then relied on drop tanks for deco gas, but understand not everyone's cup of tea....
I've run a Sentinel off 10/65 for a couple of dives @100m, then Air topped it to use as bailout on shallower stuff (75m - 80m). But that was mainly for gas logistics reasons & dive schedule planned (i.e. have to be flexible)
 possibly air top a used 10/50 cylinder, use bailouts I've got as don't want to dump gas!
 Understand a lower ppo2 for bottom bailout is better is bailing due to a CO2 hit??
This is what I do/done, please figure your own gases out from basic Trimix OC/CCR planning principles & your own level of risk!