rave_master16: I think the series length is just about right. I also read the manga (all 8 volumes of it), and not much more material can be obtained from it should a "remake" of MnH be produced (highly unlikely, but hey...)
A 26-episode would just add the other (wacky and weird) characters in the manga, more scenarios (your Xmas and summer specials are there!), and further develop the characters we do know, like Midori's childhood friend! hehe (manga readers would know what I'm talkin about!)