Matt sounds like things are headed well for you! I edit on PC and Mac via Adobe Premiere Pro CS5. This new version is blazing fast. It allows you to have multiple formats in the same timeline with no problems whatsoever.
Here are some suggestions:
1. The Adobe CS5 Production Premium Suite comes with Encore DVD. You can edit in Premiere Pro then Export the sequence to Encore and create DVDs. No pre renders. Also you can export to Blu Ray!
2. I use Canon XHA1’s, 7D, and Panasonic HVX200. All work fine with Premiere on a PC or Mac. We just got in some JVC HM100U. Those shoot to SD cards.
3. Try exporting to H.264.
4. The Premiere Pro CS5 titler allows you to create lower thirds, text, graphics etc really fast, and easily.
Here is a link to a free 30 day trial of Premiere Pro CS5. https://www.adobe.com/products/premiere/switch/
Best of luck! Dave