Now don't start with that, "But pressure cookers scare me!" Stuff it! Pressure cookers are awesome. You can tell your fear to suck it.
Not only do pressure cookers save a tremendous amount of time (short ribs in 25 minutes?!?! AMAZING), but, if you're a hippie, they save a lot of energy by taking less cooking time and putting less heat out into your home/apartment/garret.
You might see this method out there on etherwebnet (it'll likely be an article about or post by Laura Pazzaglia, pressure cooking goddess, at Hippressurecooking; her Cracked! Soft, Medium, and Hard "Boiled" Eggs in the pressure cooker from whence this method has become popularized is well worth visiting for this and many, Many, MANY more recipes). Mrs. Pazz uses a pressure cooker with a low pressure setting option (6 - 8 psi). Mine doesn't have that setting, it's only high pressure (12 - 15 psi) as probably most of the less expensive pressure cookers sold out there. My 8 quart Presto (all stainless, not aluminum) was in the $50 or $60 dollar range.
If you want the multiple pressure option you'll probably be paying in the $100 ballpark. A 6 quart Fagor on Amazon is right at $100, the 10 quart version is near $150. There are aluminum ones out there, but I'd stick with stainless as aluminum can possibly react with acidic foods.
It's not really necessary, at least not for the hard cooked variety. Just adjust your cooking time for soft boiled, medium, and hard. Maybe half the time for soft and somewhere in the middle of that and hard boiled for medium.