We already heard about ATI's Radeon X1800 XT, X800 PRO and X800 XL and it appears there's also a Radeon X1800 LE.
The X1800 LE will be the cheapest R520 and will compete with NVIDIA's GeForce 6800 LE. The Radeon X1800 LE will have 12 pipelines and a core operating at 450MHZ. The memory of this card will be clocked at 900MHz and probably this card will only be available to OEMs and system integrators at the beginning. But a retail version may follow eventually.