@catdog, ModMii installs both wanin's and hermes' cIOSs in the "install wads" step, so no need to do it again
@narse, there's nothing wrong with rev 19. The only benefit to rev 17 over rev 19 is that it still supports triiforce. However, rev17 doesn't support usb-loading from fat32 or ntfs, support for that was added in rev 18 (triiforce support was also broken in rev 18), it also doesn't support using base 57 which leads to faster usb loading speeds. Also, you should know that rev 17 has the dual layer bug, but rev17b does not, and rev 17b is only available via ModMii and/or sciifii installer v2
I'm expecting rev21 with base 56 to be the next ultimate cIOS everyone will be recommending... but who knows how long it will take wanin to release rev 21 now that the PS3 is exploding... I guess time will tell!