you’ve always helped me with mvc2 advice, so i’ll help you out.
you have a good structure with N-xxx/chun li/r2 sagat. chun li is an excellent user, and sagat is obviously a good anchor. now you need a solid battery.
honda- a BEAST in N-groove. i feel it’s his best groove over C/A groove, but nobody will ever agree with me. short jump roundhouse is amazing in his problem matchups and let’s him take a more offensive approach. you get a knockdown, run up, standing jab into 50/50 mixup of sweep or RC 360. counter roll is helpful also, because you can counter roll into 360 and immediately gain the initiative again. be sure you can RC hands from a whiffed crouching short or standing jab because you can’t dash into RC hands or 360. poke with crouching mp if necessary. check in the honda thread, i’ve written some stuff on honda there. i’d choose him if i were you. low learning curve, but you need RC skills big time.
kyo- i messed around with N-kyo also, but i didn’t like using him. P/K would be a better groove choice, although popping a stock does help with guard crush strings and damage. if you get the dizzy, popping a stock into a big jump in combo like jumping rh, standing rh, qcf + k, k, dp + k does massive damage. but kyo’s mixups are too random and unreliable, and not being able to parry or just defend takes the scare factor out of your opponent not pressing buttons. very high learning curve also.
kim- i don’t know too much about kim, but he’s better suited in C/K groove. popping a stock is nice because his guard crush strings do much more. very high learning curve, but see if you like him.
rock- best suited in K-groove by far so he can have so many level 3’s for the ability to just defend. i never learned rock for some reason, so i can’t say much either. very high learning curve again, but his mixups up close are beastly. pop a stock and your opponent will naturally turtle up which will lead to a lot more 360 grabs.
so i’d rank them as this- honda first, then kyo or rock, then kim. N-iori is solid too, just read buk’s iori FAQ, it’s all there.
peace