I'll be building a pretty small oven, about 1 meter long, .5 meter square. Not gonna be used heavily. Probably use 120c cure prepreg. What's gonna be the simplest, cheapest way to heat this? It will be on a pid controller. 

Oven elements and fans are dirt cheap, easy to wire, and will last virtually forever. I believe I paid about AU$10 for the element and AU$15 for the fan and motor, and my oven costs less than 2c per cycle - the element is virtually never on.

That said, theres nothing wrong with light bulbs either.