DFI are the best PCI-E socket 939 based motherboards you can buy, period. The flexibility you have with them is unbelievable and the number of options in regards to overclocking is limitless. The Genie BIOS will run circles around the Abit BIOS, no questions. I honestly suggest you look into the lanparty nf4 ultra-d if tiy are serious about overclocking.
Another thing you should consider is a 3200+, they are guartneed to overclock high unlike a 3000+
No chip is guranteed to do anything other than work at the stock speed it is advertised at with the stock voltage it was advertised at. Plain and simple, if every 3200+ chip was guranteed to overclock fairly high they would most likely be branded and sold as 3500+ or 3800+ chips.
3000+ is a reputable chip that usually gains just as much of a speed increase as a 3200+ though anyways.