Surcouf on Avenue Montgallet (Paris 12ieme) are excellent... used them myself before... several locations in france but have hotline as well.
http://www.surcouf.com/Institutionnel/Magasins.aspx
FNAC do a good range of stuff and will be in most phone directories
www.fnac.fr
Dr Ordinateur on 0800942947 (numero vert) seem to have a national resau also.
Bonne Chance