I made up some ECLs for them a while back for my high-level campaign. The Astral Deva has a level adjustment of +8 in Savage Species. The Movanic & Monadic Devas have a few more special abilities, so I put them at +9.
Movanic Deva, LA +9, ECL 15
Monadic Deva, LA +9, ECL 19
My notes:
Astral Deva
Savage Species Astral Deva is +8
Assume: +2 for stats, +1 for armor, +0 for stun/uncanny dodge, +2 for cool spell abilities, +1 for celestial qualities, +1 for fly, +1 for spell resistance.
Movanic Deva
Medium Outsider, speed 40 ft (fly 90 ft good)
Str +6 Dex +8 Con +4 Int +6 Wis +6 Cha +8
natural armor +8
monster HD 6; 3 feats, (Int bonus+8)x9 movanic deva skill points
SR 19
spell-like abilities (caster level 9): at will – a lot, including polymorph self at will, plane shift 3/day, raise dead 1/day.
divine equilibrium
celestial qualities + damage reduction
heavenly deflection
soothing presence of nature
Level adjustment calculated from Savage Species guidelines:
good ability scores (+38): +2
natural armor: +1
spell resistance: +1
spell-like abilities: +2
flight: +1
divine equilibrium: +0
heavenly deflection + soothing presence: +1
celestial qualities + damage reduction: +1
Monadic Deva
Medium Outsider, speed 40 ft (fly 90 ft good)
Str +10 Dex +6 Con +10 Int +6 Wis +6 Cha +8
natural armor +12
monster HD 10; 4 feats, (Int bonus+8)x13 monadic deva skill points
SR 22
celestial qualities + damage reduction
spell-like abilities (caster level 11): at will – a lot, including polymorph self at will, plane shift 3/day, raise dead 1/day.
deliverance from death
elemental ease
uncanny dodge
Level adjustment calculated from Savage Species guidelines:
good ability scores (+46): +2
natural armor: +1
spell resistance: +1
spell-like abilities: +2
flight: +1
deliverance from death + elemental ease: +1
celestial qualities + damage reduction: +1