webcam

this is the cheapest unibrain webcam I found to buy in UK:

http://store.apple.com/uk/product/TL353ZM/A?mco=NzA4MDMy
it's for £89.95

• Bright (F 2.0), glass elements, 4.3 mm focal length, lens
  
• Sony Wfine 1/4" CCD
  
• Two 400 Mbps FireWire ports
  
• 640x480 video resolution
  
• 30 frames per second
• Mac OS 10.2.5 or higher
  
• Any Mac with 1GHz or faster PowerPC G4, G5 or Intel processor

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This one would be perfect:
Axis 216MFD-V 0279-003 Indoor Network Camera
the problem: £625.56
otherwise:

Video compression

• Motion JPEG
• MPEG-4 Part 2 (ISO/IEC 14496-2) with motion estimation,
• Profiles: Advanced Simple Profile level 0-5 and Simple
• Profile level 0-3

Resolutions

• 24 resolutions from 1280x1024 to 160x90 via API
• 22 selections via configuration web page

Frame rate

• Motion JPEG: Up to 12 fps at 1280x1024
• 20 fps at 1024x768 (partial scan)
• 30 fps at 800x600 (partial scan)
• MPEG-4: Up to 8 fps at 1280x1024
• 13 fps at 1024x768 (partial scan)
• 20 fps at 800x600 (partial scan)
• Partial scan takes the data from the center region of the sensor and scales it down to present an image at optimal frame rate.

Video streaming

• Simultaneous Motion JPEG and MPEG-4
• Controllable frame rate and bandwidth
• Constant and variable bit rate (MPEG-4)

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Logitech QuickCam pro 9000 webcam
review: http://www.photographypress.co.uk/reviews/review.phtml/2172/3196/logitech-quickcam-pro-9000-webcam.phtml
From review:
The only catch however is that while the webcam will work with a Mac, none of the software is Mac compatible.
QuickCam software isn't optimized for Macs, so you're left without the audio and video optimization technology and, less importantly, the goofy video effects and filters.
To buy: http://www.amazon.co.uk/gp/product/B000T5GMJE?ie=UTF8&tag=wwwpockelintc-21&linkCode=as2&camp=1634&creative=6738&creativeASIN=B000T5GMJE
£44.78
wide angle

Interface Type: USB 2.0; USB cable 6 feet (1,8m)
Carl Zeiss® lens
Autofocus system
Ultra-high resolution 2-megapixel sensor with RightLight™2 Technology
Color depth: 24-bit true color
Video capture: Up to 1600 x 1200 pixels (HD quality) (HD Video 960 x 720 pixels)
Frame rate: Up to 30 frames per second
Still image capture: 8 million pixels (with software enhancement)
Built-in microphone with RightSound™ Technology