Hi all. Thought I had this clear but I'm struggling now!!!

Right, I want a nice set of wheel for my black 3 door. Standard wheels look OK but I want something that will fill the arch better. Escort cos wheels would be perfect and they are ET20, right?? Which is what the 3 door needs, or is that an urban myth???!!!

Question is, I've been offered some other rims for not much money. First set are 7 x 17", citroen offset (ET15). Will they fit or is 15mm too little??? Second set are also 7 x 17 with an ET38 offset (sapphire). These will fit but I assume they'll look as "set in" as the standard rims???

I'm really, deeply, confused now so, anyone out there running wheels with these offsets?? What's best??