Power amp upgrade dilemma - help needed

Hi All

I am reasonably happy with my system which concists of:
Mapletree Audio Line 2SE pre
Usher BE718 speakers
Source tends to be lossless files or CDs through the DAC

My amp is currently an ATI2002 which I have had for a couple of years and is great value


I have an option to purchase a Rotel RB1092 (500w class D) or a Cambridge Audio 840W (200W) for about the same price. I do not have the option of a home trial.

Shall appreciate any experiences others can share on these 2 amps. My music tastes are varied, I hope to add more depth to the bass through the update.

Thank you!