What are people running sound system wise?

Right iv got a Sony headunit. Off my head i think its around 50/52X4 watt. Cant remember. Iv seen people say an mx5 will never have great sound due to the acoustics of the car blaaa blaaa blaa. But what do ye find good in the doors and headrests? I find at the moment its way too thiny. No bit of base. Going to fit an alarm in the next few days so gonna see what speakers are actually in it and feck them out for new ones. Any help appreciated guys 
