I've been desperately searching for a way to get fast disk access speeds and have discovered many things.
1. RAID-0 means twice as likely to loose data/whole drive
2. RAID-0 isn't even that fast in realworld situations really only improving sustained continuous file read/writing such as duplicating a large video file, which barely makes up for the double chance of data loss
3. High RPM drives are not only very expensive but not very fast either, it will improve seek time but once It's found the data it won't get to you any faster really, only 10-20% faster for 10x the cost
The only solution providing any kind of tangible speed increase is moving to solid state memory which costs uhm... if you have to ask you can't afford it.
£1134 for 128gb
so forget it for another 5 to 10 years
64gb = £567