Even at 5.25 there are some nice options depending on the brand. Of course if you want depth in the sound then you will need a sub. The sub doesnt have to be huge and overly powerful. I would recommend some alpine midrange speakers with either a bazooka tube or a single JL W0 with a 250-500 watt amp. I would lean towards the bazooka tube because its all inclusive and its less expensive. I would spend more on the 5.25s.