Having recently asked people on What Hifi Forums for advice I feel obliged to leave some feedback. I decided to opt for the Denon PMA 720 amplifier paired with Boston acoustics A25 speakers. Maybe it's the fact that I started from a low base ( Cambridge Audio Topaz AM5 and JBL Control one Speakers) but I'm absolutley delighted with the upgrade. The Denon amp sounds stunning paired with the A25's. Using "Source Direct" the clarity of the sound is amazing and the sound quality at low levels is excellent compared to the entry level Topaz which ( to be fair) is a nice unit for it's price tag and a very good starting point for entry level HiFi.
Many thanks for the advice , it's appreciated.