|"And, does using a video card in anyway hamper the functioning of the motherboard, memory, etc? And if not what would you suggest? (To go along with the extreme audio.)"|
If you're referring to a TV Tuner/TV Capture card, then no not in the least. I own an MSI "TV@nywhere" card and it works well provided that good software is used with it. Most programs that I've tried that encode video/audio to a file from it have a bad problem with video/audio sync. To overcome that, the best program I've found in the past 2 years that I've owned it is one called U-Broadcast (http://www.freewarefiles.com/U-Broadcast_program_19746.html). It does an excellent job keeping the video and audio in sync.
This card costed about $40 but works fine. There are probably others that do better but this one suits my needs.
Some regular computer graphics cards have a video input that allows you to plug in a video source and capture with it. Maybe this is what you meant. This will work fine as well.
One note about your new PC: It's best to either build your own PC, or have one built by a friend or PC repair shop. Pre-built PCs that are made by Dell, Compaq, etc. are usually loaded with spyware as well as the OS. If you buy one of these, IMO it's best to format it and install the OS yourself. This also makes the PC faster.
Furthermore, if the power supply fails in that PC, it will be harder to replace it since it is proprietary (made especially for the brand of PC you're buying). The new power supply will have to be ordered from the manufacturer instead of a PC shop or any online store because any regular power supply will not work because of the different pinouts.
Dress modestly, it shows people that you care about yourself.