8-10k budget suggestions please

Transparent cables are what I use with my Lumin/Gryphon/804 system. My 804s are the latest version and measure comparatively poorly AND present a tougher load to the amplifier than your 804s, yet they were my choice for my tastes/room/budget etc. Auditioned lots of other speakers like Sonus Faber Totem Focal Spendor etc. Don't let other people tell you that your 804s are going to be a weak link, there are too many people in the hobby who love to tell others what kind of sonic profile is ideal. That Krell is going to be a fantastic match for your 804s, and yes buy good cables, and a good power conditioner (I use a Puritan PSM156), clean power is a must if you want the best out of all the upgrading you're doing. 

kairosman

definitely getting cables and a power conditioner.  I'll check out the puritan.

b737max

that is a definite also!  Is there a best app to download?  a little eq and room tx should do the trick!

I've never listened to B&W speakers, but it seems lots of people here are not very fond of them. You may have a nostalgic attachment to them? If the speakers are not that great, no matter how much you spend, they will never live up to the potential of the amp...I would go and audition other speakers to gauge if your speakers are worthy if a $6K+ amp.

Well I get the Krell this week!  I'll let you guys know what I think when it gets warmed up.  

How do you guys do your room eq?

Congratulations on the big step to krell!   I'm always turned off when someone slams one brand then follows up with recommendations of what they have.  The early b&w was voiced in that more traditional British sound that needed proper components to come alive. I expect the krell gear will 'wake them up ' personally I would recommend getting to know this new system b4 spending another ndime

 Playing with roe in and other placement options will make as much difference as cables.  Enjoy