Are you looking to obtain flash heads (strobes, external flashes) or a continuous lighting kit?
Both are usuable the latter being less expensive.
Strobes are preferred for many reasons, one being that continuous light can get hot and hard to sit through as a model.
Taking into account your budget you might have a hard time finding a reputable strobe kit for that price.
When I say that continuous light is usable, im kind of pushing it.. Most continuous lights are dial up and dial down which is pretty analog (which means you turn a nob to switch from anywhere from 75 watts - 1000 watts - average -. Having a flash head allows for easier use of flash meters as well.