I *hear* that Nature's Gate Organics is a reasonably-priced line with natural ingredients that works for COing.
If you're doing CO the Curly Girl way (with which I'm not really familiar) the cost of your conditioner will probably be less of a factor, because it uses very little. If you do it the Long Hair Community way, you use gobs and gobs, so a lower-priced conditioner is a positive boon.
I use the cheap ones with the ucky chemicals
: psssst ... Suave "Naturals" Chamomile has a very mild scent. So does the Passionflower. At least, compared to the way the rest of 'em reek. But I so wish they'd just make an unscented one already!