I meant to post the latest prices yesterday, but I forgot. Anyway, here they are.
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UberPC
Original Price - £5,023.82 10/05 - £4,517.28 -£506.54 
From last week:
RAM - down £32.88 (2x £16.44)
1TB HDD - down £42.30 (4 x £10.58)
Case - up £17.63
Total for the week = down £57.55 RealisticUberPC Original Price - £3,602.55 10/05 - £3,384.21 -£218.34 
From last week:
RAM - down £32.88 (2x £16.44)
1TB HDD - down £10.58
DVD Drives - down £0.80 (2x £0.40)
Case - up £17.63
Total for the week = down £26.63
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I think the shock this week is that the case has gone
up in price by nearly £20.
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I did it with the UberPC last week, and I shall do it with the RealisticUberPC this week, as it's been a month since I worked out the build.
The original price was
£3,602.55. Now, seeing as there are some components which aren't new, I'm going to take those out (160gb HDD, DVD Drives), to give me a price of
£3,532.44. Over six months, this price should halve (
£1,766.22), with a monthly drop of
£294.37.
And has it?
Nope.
It's dropped a total of
£243.57 (note - this is without the 160gb HDD and the DVD drives) - £50 pounds off the predicted drop.
Although close, the Realistic PC is not meeting the hypothesis that the price of new components halves every six months.