Digital photography

For a work project i need to get hold of a couple of compact digital cameras which meet the following criteria;

1. SD card compatible
   
2. Cable shutter release compatible (this has been my main difficulty - a pc link with software to fire the shutter could also work although i guess this is more unlikely)
   
3. Tripod Mount
   
4. Plenty of manual settings (white balance, exposure etc.)
   
5. Fairly sturdy (they will be getting a lot of use)
   
6. Fast (as in write to sd card pretty quick, at least 1 shot every 3 seconds or so)
   
   

megapixels are not important

Has anyone come across something that fits the bill? Older models which are fairly common on ebay would be perfect, budget is slim maybe around 100 each second hand?