Presto 01362 6-Quart Stainless Steel Pressure Cooker.  I LOVE IT!  Cooks Pinto beans in 7-10 minutes AFTER I have boiled them in water for 10 minutes to help them plump up.  Don't add salt or it takes a bit longer to get them soft.  It has the jiggle top, which is what Mom used and lets me know how much to turn the heat up or down.  Stainless steel is best since aluminum is NOT good for the ol' brain.