I have a mixed bag of speakers in my modest surround system which consists of Arcam AVR280 amp, a pair of Monitor Audio Golds for left and right, an old Wharfedale diamond pressed into service for centre and a pair of old Canon AV Speakers on the rear. This is obviously far from ideal but I can only consider upgrading the centre at the moment. I need a bright sound for the centre as the overall sound is too warm. I am also restricted for space and can only house a speaker a maximum of 18 inches wide. Price needs to be around £200.Any suggestions welcome