I don't do complex editing yet, so I can't help you much there. Most I mess around with the hardware capture cards and capturing (Avid, Media 100, Videovision, etc) and editing software is part of the capture system package. Premiere and Adobe afteraffects seems to have been popular for editing back in the 68K days, Avid videoshop seems to have been a freeby Apple sold or gave away with their A/V kits. Radius Edit is also ok for simple stuff (V1.0 is 68K and I think 2.0 was PPC only)

I would recommend you find those packages on the local hotline server and then check out their user interfaces. After you decide whuch UI you like then hit the usual places to buy the software since the manuals come in handy.