Nitromorse - Nope unless you can get the older stuff.
caustic - People say it doesn't strip paint but it does it just takes longer but be carefull as metals such as aluminium it will eat away at so maybe fit an old headset, bb, bolts ect
Acid dip - Don't know much about that but i have seen and heard that it does a good job but might not be cheap?
Blasting - Read over the forum it can cause stress risers
Starchem seems to be best to me Only paint stripper that works so i have been told rather like the old nitromorse 5L - £20