To my understanding, there is no way to get 1:1 quality from standalone USB devices, right? As in, the exact thing you see on your display (in resolution and FPS and MBPS, etc.) in the video file.
USB3 is good enough to get you uncompressed 1:1 video. The Blackmagic Intensity Shuttle, which is my current capture device, does precisely that, although it tops out at 720p/1080i for 60fps. It can do 1080p at 30fps though. USB2 devices won't cut it.
If you intend to do uncompressed recording/streaming, make sure to look for a capture device that DOES NOT list hardware-based H.264 encoding as a feature. These devices compress the signal before they send it to your PC.
Also keep in mind that in order to record uncompressed 720p video at 60fps to your PC, you'll also need a pretty good hard drive to keep up with the required write speeds. A dedicated external RAID-0 array of at least 2 high-density disks is recommended. As an alternative, it may also be possible to use a video editing program of your choice to grab the capture input and losslessly compress it on the fly, but I've never tried it and don't know what kind of codecs would be ideal, what kind of CPU requirement that would entail, or if it would cause any kind of audio lag/desync issues.
PS3 is a special case as there is some kind of copy protection, so no 1080p/HDMI. So I take it you can't get 1:1 quality unless you have a capture card? Standalone USB devices cannot work with HDMI for PS3, only component. This is due to the copy protection.
I haven't looked into the details, but some people have had success in getting around the PS3's HDCP encryption by using some kind of HDMI->DVI->HDMI setup. From what I understand, converting between those formats is 1:1 (unlike HDMI->component or vice-versa, which is digital->analog), and DVI has no copy protection. This requires some extra gear for audio though because DVI also does not carry audio.