Shinigbeam, Customlites, DX - All these are basically the same, 8*AMC7135 2.8A drivers. Of those, the cheapest is as good as the others.
KD V2 and IS use special AMC7135s with 8*380mA, thus 3.04A. KD V2 and IS have different modes though: By applying a solder bridge the NANJG 105C (IS or other) can be set to L/M/H/strobe/SOS, L/M/H, L/H/strobe, L/H; whereas the KD V2 offers some more options, even memory is selectable.
However there are some even more advanced UIs available, i.e. the NANJG105C 2.8A or 3.04A with custom firmware: E1320 offers a 5 mode UI (with memory, no blinkies) which is quite popular, and I offer some quite flexible drivers, too (BLF thread).