is very difficult to find the best solution for all
it depends by the combination of hard disk+games+loader used
seem that many use:
249[57]
250[37]
251[56] if you have a loader that use 251
or
249[56]
250[57]
consider that if you use pimp my wii:
249[38]
250[57]
hermes
202[60]...
so i'm pretty confused
now i have 249[58]v21 (in testing, up to now seems no problem..)
before i used 249[57]v20b without problem;)
i think to try
249[57]v21
250[38]v21
or you suggest to add only:
250[57]v21
that result in:
249[58]v21
250[57]v21
if you want here ready to download and install with a wad manager :
cIOS249[57]-v20
http://www.mediafire.com/?3meqf7e1q9wa9xi
cIOS249[58]-v21
http://www.mediafire.com/?3w8t6yag5b21asb