Denon is very good for AV performance but not strong at music. Depends on whether you use your AMP for AV or music. If you use it solely for music Cambrige may be a better choice than Denon.
Denon AVR-2105 has auto setup which is a very good and easy use function for setting up the 5.1/6.1/7.1 speakers.
It is best to buy at Mongkok Body Shop 樓上 記得講價. Even though if you do not bargin the price should be less than the chain shop like Fortress Boardway etc.
Yes Cambrigde 540R is an AV amplifier and the price is acceptable. Unless one is going to 影音分家 one cannot expect an AV amplifier with very good music performance. If one fonds of both music and movie 影音分家 is the best choice. Of course $$$$$ and space has to be considered for new hands an AV AMP I think is suitable unless he uses it for music only. If affordable of course 金嗓子 is one of the best choices but then one have to pay more on the speakers and even though the power cord and the speaker cables to obtain the best musical performance. You will not buy 金嗓子and use standard 5.1 sets of speakers
I really think it needs time (of course money) to gain the AV experience. No need to buy so high end products at the initial stage la (except money and space is not the question)