I have found what seem to be products that perform almost exactly the same function for next to nothing. The aforementioned input card is PCI-E and costs around $1,000. These are about $50 and are mainly standard PCI cards:
Namely this one:
Why is the first one so expensive and the others so cheap? The system I am building MUST be a robust one. Are there any other alternatives that I have not seen?
Also an option to use two different cards for audio and video is an option, but not preferred.
As always... thank you for your help in advance