Well, in general, if we're talking self defense here, I tend to avoid throws which present my back to my attacker, so that would rule out most shoulder throws and things like that. I am too concerned that I might be dragged backwards into a choke if something stops the throw.
I tend to rely more on sweeps and trips as the opportunity presents itself-- osoto gari, ouchi gari. At the dojo I train in we do a yama arashi variant that looks like osoto gari which I have come to trust. It basically is osoto gari, but your off hand moves through the attacker's shoulder, so you can work the throw from the outside. The fall is a rough one to take, and you could at your option cause the attacker to land on his head or separate his shoulder.
You should work on the sutemi waza (uki waza, et al) until you get more comfortable with them. Don't think of them so much as throws you do to someone first off, but rather as counter throws you can execute if someone is taking you down. That may make it easier to pull them off, assuming you have someone you can practice with who can take the falls without getting hurt.
[This message has been edited by the504mikey (edited 07-14-2004).]