if your wanting to sell it, then it will be easier to sell with the standard spec, if your wanting to sell it the way it is, then advertise it in mag's, paper, autotrader, clio owner club forums, cruising forums, the more you do then the more chance you have of selling it.
if you dont want to sell it then how about getting bigger wheels? that should lift it off the ground a little. lowering your car will always bring problems with speedbumps, mines lowered an i have to crawl over bumps at 5mph, i dont mind but its the price you have to pay for lowerin you car
hope this helps