What exact items do you need to get around this and record HDMI 720p/1080p PS3 footage?
If you just need to strip HDCP, look for a device called HDMI2HDMI + Audio. I bought
this one a couple weeks ago and it works great for my needs. Be aware that the audio output on the HDMI port seems to be fucked (I get regular "popping" noises about once per second), but the dedicated audio jack is fine.
This is way more convenient than DVI conversions, imo.
Ideally I want to record uncompressed/raw footage, 1:1 with what's on the screen. But it is to my understanding you need to have an above average desktop PC with internal hardware (BlackMagic, etc) equipped to do this, correct? This is why I went for the Elgato, which seems to be the best of the external USB devices.
You are not going to get uncompressed, HD, 60fps footage from a USB 2.0 device. USB2 is simply not fast enough, period. You need either an internal card or USB 3.0, and you have to make sure that the device DOES NOT have always-on hardware-based H.264 encoding.
I told you this a few weeks ago.
FWIW, you don't generally need "above average" hardware for the most part either, depending on what you want to do with it anyway. If you simply want to record uncompressed HD footage, you'd need a fast, high-capacity hard drive, but you wouldn't necessarily need a beefy CPU unless you also wanted to compress/stream on the fly or something. And if you're compressing the footage as it records, then you don't necessarily need a dedicated hard drive. One or the other, basically.
is there any that bypasses hdcp (single kit)? i feel next consoles may have always on hdcp
See above. And if you weren't already aware, the Xbox 360 and Wii U do not have HDCP.