Is it fine to bunch together power wires?

What pet said. 

Hi,
best way to keep them seperated or if not possible try to make the cross each other.

I avoid that.  

The biggest issue occurs when cables run parallel to each other. Crossing is not so bad, particularly at right angles. You are better off having a jumbled mess than having all the cables neatly organized running parallel, even if they are spaced a 1/2" apart. The amount of current that is induced in the neighboring cable is dependent on how much current is running through each cable, how close together they are, and for what distance. Having cables occasionally cross each other will result in a lot less induced current than running them parallel in close proximity for more than a very short distance. 

Thank all of you guys/gals for your input. Although I have a nice system and do hear subtle tweaks that I do but never tried keeping my power cords independent as possible. 

There is an art to doing the current way I have mine now, but going from now to what I have been reading here will take even MORE artistic ability. 

Something I may have to draw out on paper before I even begin. Everything goes into play with where each component sits to how long a power cord is to space in the cabinet. 

I've got lots of work to do but and the best thing about this is that...in general the costs should be FREE! YAY! 

Hopefully unless I need to buy a longer cable or something!!!