Well, price wise, if i convert it to UK pounds, i would say deffo mate...
However, need to take more things into account than cost when purchasing lights..You need to think about how good the actual ballast is as that is the part which will cause the problems if its a cheapo nastyo ballast....
On another retailer's site (J&L aquatics), they sell that fixture for about the same, but then you have to add on the ballasts and bulbs... I would contact them about what it comes with, as a 250W DE bulb and ballast runs you about $300... Somethings wrong with that price tag.