I needed a Casio EX-F1 for a recent shoot I did. This camera has been mentioned before here, but for those of you who don't know what it is, it's a digital camera that also shoots high speed footage. The frame rate goes up to 1,200fps, although it's at such a low resolution at that speed that I would not use it. The footage in the following video was shot at 300 and 600fps.
[ame=http://www.youtube.com/watch?v=3o6RXKEokFU]YouTube - Slow Motion/High Speed Shotgun Shooting: 300 & 600fps in HD - Casio EX-F1[/ame]
The camera itself cost $700 (£422.47). I think it works well for the way I was using it, although it certainly has it's limits due to the low resolutions.
The next best option would be the Phantom Miro which costs $10,000 USD, and rents for about $3,500 USD a week.