The Opera 8.5 for is a beta version. It says it is trial for 45 days. It will sold after it comes out of beta and I don't know how much it will cost.
Mozilla's version is minimo and it too, is beta.
The other products are all commercial ware (the full products are a bit the expensive side as ppc software goes) but are still better than PIE. There are also plug ins/add ons to PIE that make it better.
Search is your friend and you will find several threads discussing the options.