Good luck with Premiere Pro.....if you put the preview setting on a very low quality setting you may be right.
The only program that will cut all those formats easliy together at full res preview and in realtime without any rendering ....can I say it....

.....EDIUS
Infact you can throw in some PAL or NTSC mini DV4.3 - 16.9, DVD mpeg2, DVD VOBS, wmv, QT.H.264. EX1 mxf with it as well while you are at it.
Let us know how you go.