When assessing PCs you never mention the hard disk spindle speed. How critical is this to performance and is it worth splashing out an extra ú20 for a faster spindle speed?
The faster the spindle speed, the greater the quantity of data that passes beneath the disk read/write heads in a given time. This means that data can be read from or written to the disk more quickly. However, all data that is read or written goes via memory buffers in the hard disk controller, so spindle speed is just one of the factors that contributes to performance. It's doubtful whether the difference would be noticeable except when running benchmark tests. Whether that is worth ú20 is for you to decide.
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