I really rate the Bosch aerotwin flat blades ever since I had a retro-fit set on my A4 back in 2007.
Bosch do an OE-fit set for the A3 and they can be had online for about £22, much cheaper than over the counter with Euro Car Parts , even with a discount code.
The Bosch blades currently on my car are much better than the (Genuine) SWF aeroblades that came off.