why don't you go for 5970's instead? similar hash rate and less power consumption.
Actually that's what i was thinking too... but i wasn't sure about it.But (again), why is the 5970's price is so high? It's price almost the same as the 6990...
Do you know when will there be 6990's at stock?
Maybe I should wait a few weeks?!?!Sorry, don't have any info on this.
EDIT: but if you're located in the UK you can find 5970 in http://www.scan.co.uk/products/4gb-gigabyte-hd-6990-pci-e-21-(x16)-5000mhz-gddr5-gpu-830mhz-3072-cores-dl-dvi-i-4x-mini-dp
last time I checked they were in stock @£500smth.