> Should I de-interlace my DVCPRO HD 1080i timeline before I export to progressive DVD
Well, if you want a progressive DVD from an interlaced source then some form of deinterlacing is required.
> Should this eliminate the "noise" artifacts in some images
I seriously doubt it... maybe I don't fully understand your meaning here.
> Does this kill my resolution?
Yes. Premiere's deinterlacer sucks. You should have a look at my
HD -> DVD Workflow. Although the "basic" example outlined on the page is for 1080i -> interlaced DVD, the "advanced" workflow referenced at the bottom of the page can do progressive output also -- and will get you much better quality in general.
Also see this thread...
... and please post any questions about the workflow there.