Best PSU for my build?

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: XFX 650W 80+ Bronze Certified Semi-Modular ATX Power Supply (£69.50 @ Ebuyer)
Total: £69.50
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-01-02 13:39 GMT+0000)

Is Semi-Modular PSU, also the Recommended PSU Wattage (W) for the R9 290 is 650w.
The XFX is one of the best (price/performance) power supply which is made by Seasonic.

Corsair TX650 is one of the best out there:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139020

If you want it to be Modular, you need to spend more:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139031

The Super Flower recommended above is the best of the bunch both in efficiency as well as in voltage regulation and ripple and noise. The Seasonic M12 II and XFX are basically the same unit since Seasonic makes all XFX power supplies and they would be still excellent but a small step down from the Super Flower. The Corsair units are also very good but they would be third on the list.

If anort3 recommend the Super Flower go for it.