I bought the sleeving 'kit' from mdpc that has all the black heatshrink/sleeving you could need for a power supply, then I got 10meters of red sleeving for accents (red/black), I sleeved all of my hx1000 (with the exception of a few 4 pin cables and such I don't need) AND did extensions for my 24-pin and three 8-pins and I still have some left over.

Might just want to do a rough estimate, say your extensions are 12"
24pin + 8pinx6 + 10x24 (just rough est. for fans if they were 24" each), + front say 5*24
Is 693" of sleeving so say 700" to feet is: 58.3' which is about 17.8 meters
Then plus heatshrink & sata cable sleeving.
Since you have to buy in 10meter lengths, if you want to do two colors get one [10 meter] section of each, plus heatshrink and sata sleeving/shrink