Helbel,
I've got the Nike triax 42 which has enough lap counts (42) for your Km's splits in a marathon. Picked it up really cheap from an advert in RW.
It's got lap/split, counters, 8 alarms, dual time, timers, data, in-fact about the only thing I can't get it to do is run for me. It even tells the time!!!!!!!!