I currently use this http://www.amazon.co.uk/dp/B007C008L2/?tag=pcp0f-21
Great ventilation, plenty of room and great for those massive coolers. Also very good for keeping the noise in
Oh and its only £50
PCPartPicker part list / Price breakdown by merchant / Benchmarks
Case: Fractal Design Define R4 (Black Pearl) ATX Mid Tower Case (£89.29 @ Scan.co.uk)
Total: £89.29
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2012-12-11 22:09 GMT+0000)
There ya go.
Edit: Just saw that someone else linked this lovely case.
Give this case a try? http://www.nzxt.com/new/products/cra...es/phantom_410
Corsair 500R at or just below the 100 pound mark, Vengeance C70 a tad above or the 600T comes in at around 150 pounds, and can all be found in white. There's also a white and blue CM 690 II Advanced version that comes in at around 90 pounds.
You can also consider the Bitfenix Shinobi cases, which come in white. They are around the 50 pound mark.