I am looking to do the same. I have recently installed a new HU and now looking to get some decent speakers. I came across speaker sets with honda adapters such as edge and fli. I found those on ebay so maybe worth a look there ? Ones I am looking at at the moment are edge ed205. They are £30 including adapters.
I would personally recommend looking for known brands like with anything as at least you will know they will last. I am no expert but I have heard good things about Vibe, Edge and Fli.
Are you looking to do the full upgrade or just the front ?