I would not use a VCR to DVD recorder. You will have no way to improve the material. Menu designs and chapter creations are very limited. By using your Mac you will have total control of how the DVD looks and works.
Let me assume that these movies are important to you and that you want the best quality possible.
You need a device that will take audio and video and convert it to FireWire.
I tried many converters but found the Canopus ADVC300 to be the best.
With the Canopus ADVC300. Audio and Video go in, FireWire comes out. It also comes with a nice Macintosh application that works flawlessly with iMovie 06 and iDVD 09 (I have used it a few times with iMovie 09). The software that comes with the Canopus ADVC300 has some incredible filters that can _improve the picture as well as the sound_. I sometimes use it to reduce the background "hiss" found in some tapes. Well worth the price.
http://www.canopus.com/products/ADVC300/index.php
For the best quality (and easiest workflow) I would do the following.
Connect your VCR to the Canopus ADVC300. Connect the Canopus ADVC300 to your Mac with a FireWire cable. Run "Picture Controller" (that's the program that comes with the Canopus ADVC300), then run iMovie 06. Why iMovie 06?
iMovie 09 uses single-field processing. This means every other horizontal line of the video is thrown out, which reduces the sharpness of the footage.
Your primary workflow is editing DV clips and making DVDs, iMovie '06 is better suited. Your movie will arrive at iDVD in DV format, which is an ideal match for making a DVD: same resolution, same pixels, same aspect ratio, and original quality. If you share your movie from iMovie 09, it gets re-rendered at 640x480 or less, and then iDVD upscales it back to 720x480. The end result is obviously not as good.
iMovie 06 and iDVD 08/09 is a "lossless" combination.
You can get iMovie 06 in a number of ways. You cannot download it FROM APPLE any longer. You can also find iMovie 06 on the iLife 06 install disc. You can buy iLife 06 on Amazon or eBay.
But be prepared to pay about double the cost of iLife 09 (but well worth every penny). Seller's are becoming aware of its value.