If you're looking to make videos and become a content creator on YouTube you'll definitely need a full HD Capture Device, The best option of a hd capture device is the HD PVR 2 or the HD PVR 2 Gaming Edition PLUS.
So many people upload to YouTube these days standards have been set, If you upload anything less than 720p or 1080p your video won't be watched as people like to see top quality content.
The HD PVR offers some excellent features.
Above you can see what the new Hauppauge Capture software looks like (
www.hauppauge.co.uk/site/capture ). This software allows you to record in full 1080p while having the options to tweak a lot of stuff.
You can see I have my inputs to HDMI, This is obviously the best and easiest option for a capture card
You can see that you can have a mic input, You can record a live gameplay while talking over the top in real time and to make sure you can be heard there is a volume tweaker which allows you to turn the game volume down and turn your mic input up.
StreamEez is the part of the software which allows you to stream to services such as Twitch.tv and Ustream, YouTube will be implemented eventually also, This is really great and so damn easy to use.
If you don't have great editing software such as Sony Vegas Pro 11, You can make do with using the programs own editing software, It will allow you do perform basic actions and get the job done.
You can upload directly to YouTube via the program also.
If you don't have the best computer in the world as well, the HD PVR Range from Hauppauge has the lowest PC minimum specs on the market.
The HD PVR 2 and HD PVR 2 GE+ have a button on top of the device which enables one touch recording, with one hit of the button you can be recording.
The HD PVR 2 GE+ is provided with FREE Mac software if you are a mac user which I hope you're not

WINDOW FTW. (
www.hdpvrcapture.com/geplus )
Anyway if you need any help be sure to shoot me a PM i'll try answer your questions asap when i'm on the computer.
Good luck picking a capture card, I do recommend the PVR though.
Peace