yeah its a shame 2c-i can be so stimulating, esp since imho the ideal dose for a worthwhile psychedelic experience w full effects starts at the 20 mg range up to 35 mg..which is where the dosage cap ends according to shulgin.
im sure many of you who have had 2ci at 25-35mg will agrree tht its a totally diff ballgame at those dosages. had i never gone above 16 or so mg as suggested i wouldnt care for it like i do. it produces some of the most amazing rainbow tracers at higher doses; almost like a deck of cards spread out if that makes any sense- frame by frame tracers of every color behind everything- and the stimulation is somewhat controllable imo- it can be a very zen- like experience if treated and pushed in the right direction. perhaps try some kratom, or some other calming substance w a full proper dose to really see where this one shines.
to get back to your question,lol- i'd try 2c-b if you can get ahold of it.
if not 2c-c is a real gem. not as potent,no, and some complain about this aspect, but my opinion is if you do the price breakdown its still relatively cheap to get a good trip out of it (50+mg)
Be sure to start off lower with it your first time though. even though most find it very gentle, some almost too gentle, i have a few friends who are super sensitive to it and find 50mg overwhelming.
never forget,YMMV.
ive never had 2c-d, but i hear good things of it as well. 2c-e is not very stimulating for me but it does have some unpleasant side effects, and not really comparable to 2ci,c, or b.
i say try 2cb or 2cc. come back and lemme know wht you think
P4P
EDIT: oh, and +1 on spaceheads suggestion of doing a combo. i find some of the 2c's to really compliment each other well...2c-c imparticular goes well with any of them. maybe take half of your normal 2c-i dose and ~25mg or so of 2c-c and see what happens. 2c-c, as said, is quite relaxing, and very laid back, sometimes to a fault. perhaps combining the 2 will help you find your happy medium you are searching for. i find 2c-c and 2c-b to be a sensational combo...happy researching!