Wait, component to VGA adapter or transcoder? I'm assuming transcoder.
BTW, to be on the safe side, might be worth it to pick up the NextVision N6. It's an HD scaler of some sort, it is capable of receiving 480i, 480p, 540p, 720p, and 1080i and scaling the output to VGA 640x480, 800x600, 1024x768, 1280x960, 1280x1024 and maybe a few other resolutions I missed, though 1280x1024 is the max. Not sure how well it works, but it seems like it guarantees that the HD content will work. I believe it may only support HD through the component inputs though. It runs around $200.
There's also two higher end models, I believe the NextVision HD10 and HD12, not sure how they're different(think they support digital audio input, not sure what else), and I think run around $300 and $400 respectively.