It depends what are you after Manchu?
If you're wanting to try a tier list, they are generally not really competitive. But by all means they are not weak.
I think the
eNemo tier list can only use Stormguard?
I know he has to have 2 stormguard units, and i think 2 fireflys and the 4th bit is 3 or more heavies. (not entirely sure my friend owns the book and i haven't seen it in over a month

)
If you want it to be Powerful then drop a few fireflys for chargers due to his feat.
If you want to be fluffy then take What ever you can, the Tier restrictions are there for that reason
I dont know why you have 25pts and 50pt

i think the most commonly played is 35 or 50? but that could just be around my area.
JR is optional but the squire is definatly worth it.
with Pow 12 stormsmiths, its insane not to take as many as you can. the one thing i hate the most playing against cygnar is Distruption. completely shuts down jacks :( and as a menite i dont have power boosted either.
For your 25pts i'd say not bother with tier list and Drop 2 fireflies. Take 3 stormsmiths and an Ironclad, and its pretty nice
Can also drop JR for the Stormblade
UA. It gives them assault which is dangerous if they charge a Jack.
For 50pts go with the tier list. Keep what you have and drop the stormblades, you can buy 5 stormsmiths.
Or drop the stormblades and JR can take a Lancer and 2 stormsmiths.
The lancer allows nemo to sit back and exchange upkeeps spells between his jacks/men safer, Also for the possiblilty of spell assassination with Electrical blast.
he can cast twice with 1 boosted hit.
Then pop feat, Take focus from his jacks then do it again. Not the most perfect of plans but The more versatility you have in warmachine, The better things will go for you