I have used models from OMP for several of my stock photography shoots. I typically give the models one of two options:
1. The option of compensation up front for a signed release (these are paid-for images and I may or may not provide a CD of the shoot to the model, depending on the rate that I pay the models)
2. The option of trading images with them. I will divide the shoot in half and if the model is willing to shoot a specific genre with me (i.e. business images) and sign a model release, then I will shoot the other half of the shoot with whatever images they want for their portfolio. This is a very popular option with models because part of my offer includes a CD of the entire shoot and I offer to edit a selection of images for use in their portfolio.
In conclusion, OMP is an excellent place to hire the talent needed to achieve the great ideas you have for solid stock images. Good luck with your stock photography career!
See more images by Legacy Images Photography on his OMP Portfolio.