Been toying with this for a few weeks since the Dell Vostro deal was first posted on here (REP to those who found originally and who posted the discount deals - I'm not trying to steal your thunder).
Pisses me off when companies do this, Originally I worked through this:
Picking the middle option when you select the Vostro 430 (one with i5, 320GB HDD and £40 discount)
Upgraded to i7, 1333 4GB, logitech mouse and keyboard = £406.42 + VAT
Picking the right option (with i7, 500 HDD and £70 disc)
Upgraded RAM to same as above, mouse and keyboard = £426.42 + VAT
How exactly is anything free? All they've done is crank up the price of the i7 system and offered a bigger discount. So its £20 for extra 180GB of storage. (its £40 if you upgrade to 500GB via the middle option - excessive prices).
So the solution is this, it may work, it may not.
£40 discount option (middle one): Change the logitech keyboard for £4.50 (opposed to £14 - glitch), The i7 processor for £70. (I left it with 2GB of 1066 RAM - explanation will follow)
Brings total to: £370.42+VAT with 20% discount code. Inc. VAT: £435.24
(Also added the 2.5% code and it was sidelined, may not clear but worth £9.26 - possibly £425.98).
Topcashback offering £18 plus 6% (of ex VAT price - £22.22) on Vostro's = £40.22 (If -2.5% VAT works then, £425.98-£40.22 = £385.76)
Now here is my jiggery pokery. Buy these two items:
6GB DDR3 1600MHz RAM - £97.11 - http://www.amazon.co.uk/gp/product/B001IT4BWA
300Mbps n WiFi USB Adaptor - £13.11 - http://www.amazon.co.uk/LM-Technologies-Wireless-Adaptor-Compatible/dp/B001EL41MM/ref=sr_1_1?ie=UTF8&s=electronics&qid=1264043115&sr=1-1
And you have a Intel Core i7-860 2.80MHz
Windows 7 32/64 bit
OCZ 6GB 1600MHz DDR3 8-8-8-24, 1.65V RAM
512MB ATI RadeonTM HD 4350 (DVI, VGA,HDMI)
WiFi n 300Mbps
16x DVD RW
Wireless Keyboard & Mouse
Standard Warranty 1 Year Collect and Return
Microsoft Works 9.0, Norton Internet Security 2010 - 15 Month Protection
for £495.98 (or just over £505 if the VAT code doesn't clear & 2GB of 1066 RAM to sell on ebay for £20-£25) to bring it down to potentially £470.
Upgrade HDD is simple and cheap via Scan or Overclockers i.e. Now expired but this 2TB was approx £86 - http://www.hotukdeals.com/item/578124/2tb-seagate-barracuda-lp-sata-ii-ha
Codes are only valid for a few days though and Cashback can be temperamental. All offers give free delivery.