Be Quiet! could have a value-priced winner with their Pure Power L8 700W PSU, which has enough power to handle SLI/CrossFire but with a non-modular design which should keep the price fairly reasonable.  With two 12V lines capable of providing up to 53 amps you will be able to run two powerful GPUs, though perhaps not paired flagship cards.  As far as efficiency goes, Legit Reviews found it to deserve the 80 Plus Bronze rating it carries and the power regulation and ripple were both very good for any PSU, let alone a value priced one.  You can't buy it yet but you can see the review right here.

"Be Quiet! is an European company which, despite the strange name, is a very well-known manufacturer amongst enthusiasts, mostly for their high quality (and notoriously expensive) power supply units. We had an encounter with their very impressive Dark Power Pro 10 series a few months ago; however, impressive as it was, the price tag of such a power supply would certainly drive the vast majority of users away. Today we will be having a look at the least expensive PSU series currently offers, the Pure Power L8."

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