I've been lurking in this forum for the last month gleaning bits of information and I've reached a point where I need advice. I've made a diagram of what I'm attempting to achieve:

I work in the games industry and my main objective is to set up a workflow at home where I can connect multiple Consoles to a Video Capture Card in my PC so I can record games footage. I've chosen and ordered my PC capture card, a PV3 Video capture card from Japan http://earthsoft.jp/release/PV3.html, it has two Japanese standard "D terminal" inputs, these are just component inputs with a different connector, its easy to get Component to D Terminal leads with zero quality loss.
So in the diagram above I need to connect all the outputs from the consoles to Component connectors (D Terminal) on the Computer. The consoles with solid black backgrounds are no problem as they all support Component Out. From then on it gets harder, if I purchase the X-Select D4 http://nfggames.com/games/xselectd4/ as shown in my diagram above, I can connect the Sega Saturn and Dreamcast via RGB Scart cables to the Japanese RGB Scart In on the X-Select D4 with some minor Scart cable rewiring.
I can then take the D Terminal output of the X-Select D4 straight to the D Terminal of the PV3 video capture card. Where I'm stuck is what do I do with the Nintendo 64? The best I can get out of that is S-Video (unless I get sucked into modding it to support RGB Scart) which would be fine but how do I feed that to the Component on the PV3 capture card? Can the X-Select D4 Jap. RGB Scart In be utilised to support S-Video? Got a better idea?
Alternatively there's the XRGB-3 which takes everything I can throw at it (including S-video) but doesn't output Component, I'd have to convert the VGA back to Component, I don't know how lossy that is in quality and the idea of another conversion doesn't sound like a good idea, plus it has limited Component Inputs and there'd be a heap more manual cable swapping.
When I'm not capturing to video the output from the Switch box (X-Select or which ever) can just go straight to the Component In on my standard definition TV. At a later date I may get a HD TV if anyone wants to factor that into their advice but that's not my priority for now.
Great forum by the way, hope someone can help or let me know if I've made some major miscalculation before I go ahead and buy anything.
Cheers.