Now I am waiting for entry level dual cores for around 12k... They will come soon...
Ace 2? even i am waiting for same but the thing is, we'll be having some descent dual core at ~18k (Optimus 2X was there once upon a time) so 12k for a slow dual core mobile mayn't make much sense. Over that, there mayn't be any el-cheapo dual core mobile. I expect the least priced one to be around 14-15k.
coming to topic, Atrix 2 have better specs than Galaxy R. lot better. Specially the screen, internal memory & camera.