Good choice, dabs.com is always cheaper than PC World :p
Anyway, only number one looks like a video capture card to me (and it uses a spare PCI slot, so doesn't replace your video out card), the other two look like external dongles providing you with the extra ports to plug the devices in. Out of the two external ones, I'd pick the USB2 capable one, since the USB1.1 one can only capture at 320x240, which is pretty poor if you ask me. Probably partially due to it using such a slow bus speed though, but still. I think it depends on what sort of usage you're intending on doing as to whether you'd go for internal or external :p