Would this be much of an upgrade.


I'm currently considering a Parasound A51 to replace my B&K 7250 II 5 channel amp. My question is would this be much of an upgrade, or would you recommend something else.
Utilize my system for both HT and music on a 50/50 basis.
The rest of my current system:
PSB Synchrony One Speakers
Integra DTC 9.8
Ayre K5EX mp
Music Hall CD 25.2
PS3
Sonos
Cambridge DAC Magic
Thanks for your help.
larryski2
Post removed 
Sorry, the sub is an Outlaw LFM-1EX. Thanks for your thoughts.
Post removed 
Bob you are correct about the digital. Very satisfied with that, but wanting to upgrade the 2 channel end. Unfortunately, no space available for another amp, so can't go with a 2 channel amp addition. I'd like to upgrade my amp, but it has to be 5 channel.
Cables are all Nordst Red Dawn, but single ended Processor and pre amp to the B&K power amp as it doesn't support balanced inputs. DAC to preamp are balanced and speaker cables are Nordost Red Dawn as well.
Any and all recommendations on a power amp would be appreciated as would any other recommendations or suggestions anyone might have.
Post removed 
Yes the Parasound A51 would be a move up over the B&K.