Looks pretty good to me. I reckon that it will work.
There are a few USB devices that should work. I don't have any of them myself.
I do have a Nebula PCI card and I know of others with Nebula USB2.
It is relatively expensive but probably the most functional ... but that functionality comes with some drawbacks in that the software seems to make three steps forward and one step back.
Interesting function is that it can record more than one channel from the same mux.
They also support daisy-chained devices. This is one of the new areas in their software that does not work for everyone.
General benefit of PCI card solutions is that they are on when the PC is on. Issues that people have with USB devices appear to be mainly around boot time and resume from hibernation.
You can search the forum for "USB" and extend range to "Any Time" - you will see a few references from people with devices - some working and some with problems.
Paul WebsterDABDig creator