GMax is your best choice. It's free and it has been used for a long time for moding. It's a 3dStudioMax version which can only be used for modeling and texturing (and animation I think). I think it was even included in Flight Simulator or Unreal Tournament. There's also a free version of Maya call Personal Learning Edition. It's based on Maya 8.5. However I don't think it can work with the OBJ format. For modeling purposes, it has the best interface and tools you can imagine. Takes some time to getting used to it but there are tons of tutorials on the net to get you started, and then there's the Digital Tutors series of tutorials (but it costs a lot).
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