ive got an 30gb and n i got loadsssss of kirtan! the rainsbai kirtans usually take more space then the ragi stuff due to length of kirtan so it all depends on wot ur listening. ive got like 10-15gb of Akhand Kirtan, 10ish gb of ragi kirtan and dharmik songs etc, about 5gb of Gurbani & Katha Vichaar etc and just videos and stuff and my iPod lasts me like a good week (and i use it alot!).
battery life is good when playing music but when u watch videos it will drain your battery like anything so i dont watch videos much. the nano is more or less the same with just abit more battery life. my friend has a nano and he has it on alllllll the time n the battery dies after 4/5 days. so its not bad.
iPod Nano is good but if i were you id buy the video iPod 30gb (or 60gb if u got the paper),got wayyy more space and also good for backing up ur kirtan (incase if ur computer crashes or something) ..and not only that it plays videos weeeeeeeeeeeeee!
:TH: