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What you're looking for is an analog frame grabber that supports DirectShow (which works out of the box with NI IMAQ like any webcam) or otherwise provides an API thats easy enough to integrate into LabVIEW. We've had good luck with ImperX and their analog frame grabbers designed for laptops. They have DirectShow drivers and their own API which gives some additional control over acquisition (and a LabVIEW driver). It doesn't look like your PC supports a Cardbus card, so thats probably out of the question. There are a number of inexpensive analog USB frame grabbers which might suit your needs. We've tried some of them and have found all of them to have some quirks (nothing serious). Most of these are pretty cheap, so you might as well try a few. Since these will all appear like a webcam, they'll directly work with IMAQ... so write the code once, try them all. We've been looking at another product from Pleora, but they have an analog frame grabber that works over GigE.

In fact, you can even use an XNode version of the OpenG code written by Gavin Burnell, and he has also written a few more Array XNodes including one which replicates your code.