Great bike but couple things working against you for conversion. 700cc is the 1st hurdle for a hub motor. Next thing is an ebike barely needs 3 spds, let alone 24 spd.
You might be better off using a Cyclone BB drive - take advantage of all those gears and you don't have to monkey with your 700cc wheels.
I suggest you get to know Electric Rider on the other end of your state in Lawrence, KS. A 26" 36/48V Roadrunner setup would run about $600-700 respectively. Mind you, that's with heavy SLA batteries. $350-400 sans batteries and you won't be disappointed getting into Lithium - costly but excellent characteristics for ebikes. Make friends with RC airplane folks!
http://www.electricrider.com/index.htm
I like my ebikes to be 26" cruisers. Comfy seats, slightly feet forward, easy on/off. 3-5 spd internal hub gears at most - you got a motor, ya know?