The SX model has 6 PCI slots, and can use both AT and ATX PSU. Has a connector for the power switch on board. The LT4 model only has 4 PCI slots, and can only use AT PSU (you can use ATX with an adaptor of course, I do it myself, but you'll have to find a solution for powering on and off).
Neither models need a reset switch, so no problem there. All your tower needs is to have a power button, and the correct backplane, so the PCI boards are alinged correctly.