Reply to Windows 7 x64 and Digital DJ'ing, drivers, audio interfaces

Anyone have experience with various usb audio interfaces with windows 7 x64, at the moment I can't dj in tracktor with my searto box due to driver issues, it works fine in windows xp but not in windows 7 x64. As more and more PC users upgrade laptops and they suck in a sticky situation, lack of good drivers.. On the NI community s there are many people complaining of pops/lag/issues with the audio 2 and 4 interfaces under win 7 x64, the other issue is some newer hardware doesn't even have windows xp drivers, i just picked up a new acer core i5 laptop and all the drivers are for windows 7 x86/64. Anyone have experience with the audio 2 dj in win 7 x64? I'm also looking for something with great win 7 x64 driver support, balanced +4dbu outputs, and a headphone amp/channel, and USB connectivity.