Tedy,
I'm pretty sure the only difference between the A1 and T1 version is that the T1 only comes with a fewer cables and a shorter 3-year warrenty but I could be wrong? On the other hand, the LT version has a different north/south bridge and is a bit cheaper. The A1/T1 version comes with 680i/590 chipsets whereas the LT version comes with 680iLT/570 combo (which will probably be a better combo because some changes have happened with the 680iLT chipset, and heck if DFI is using this combo on their new 680iLT release it's good enough for me), lol!