Which Cables Are of Most Importance?


In a hi-end system, McIntosh, B&W, which cables will give me the most bang for the buck between IC's, speaker, power and HDMI? Which cables are most important and which are least important? Will concentrating my $$ in any one or two cables give me the most bang for the buck?
stockinv
huge difference in HDMI cables, especially over the generic cables supplied with components
So this if the cable that beats the Teo? Wow another copper cable. Kool brilliant.

Diamond Reference Black Gold Interconnect
Type: Analog interconnect
External Jacket/O.D.(mm.): PVC/16 
Operating Temperature: (- 30° + 80° C) 
Number Of Conductors: 4 
Type Conductors: Graphite/Copper 
Conductors ( Qty/mm.): 160 x 0.10 
Insulation Type/O.D.(mm.): XLPE / 3.2 
Shield Coverage: 98% 
Capacity Maximum: 83 nF/Km. 
Conductor Resistance: 16 Ohm/Km. 
Shield Resistance: 12 Ohm/Km.
Price: 1400€ for 1 meter stereo