All the banners are great for attracting PSA's. The important part is what is added with the banner. Just add a short paragraph telling a little something about SFI.
Remember to be honest and to the point.
Try different banners with different slogens, then go with the ones that are working. Spice up the ones that are not working so great. The banners will work great with a bit of personal touch to it.
Try different area's of marketing websites as well.
All the best to you