injectors-clean and rebuild or new ones!?

[dwayneb]

If it is going to cost me $22 each to get the injectors cleaned and pop-tested plus extra if I need parts, doesn't it make more sense to buy new ones? I'm asking because I haven't messed with injectors before. If I buy replacement injectors, will I need to do anything to them or just screw them in? Correct me if I'm wrong, but don't you need to replace the heat shields anytime you remove the injectors?

Thanks.