Cheapest place in uk i've seen this price is when using 5day super saver delivery.
This cpu overclocks to about 3.5ghz which is most boards fsb limit (around 455-475 for 45nm quads), has a 7.5x multi and uses 0.5x increments.
Has fantastic reviews.
This is OEM, so doesnt come with heatsink/fan and comes with 1yr warranty instead of 3yr which retail comes with.
Cheapest place i've seen Q9450 is £200+ p&p and 2 places selling it for £207 + p&p, none of those 3 places have stock tho:(