Just as an FYI, Asrock is made by the same company as Asus, they're just the "Value" stream
If you are looking for the absolute best socket939 nf4 boards, get either a DFI Infinity or if you have to go all out, get a DFI LANparty as I gurantee you everyone will tell you they are the best boards to buy next to the more expensive Asus A8N32. You may also want to consider the MSI Neo4. The majority of Asus 939 boards are IMO not very good quality
If you are looking for the absolute best socket939 nf4 boards, get either a DFI Infinity or if you have to go all out, get a DFI LANparty as I gurantee you everyone will tell you they are the best boards to buy next to the more expensive Asus A8N32. You may also want to consider the MSI Neo4. The majority of Asus 939 boards are IMO not very good quality