I own the Sony DRU-510ak and the TDK 440n but i don't know if they record on to DVD-RAM if someone could advice me it would be very helpful, and if they don't record to DVD-RAM which ones do???
Pretty much all of the LG DVD burners (with the exception of the 4161B) can record to DVD-RAM. The newest LG, the 4163B, seems to be a really nice burner. You may want to try that one.