+1 twoleftears - I fully agree if a cable price would bump you into the next component model up, that may be the better option.
In my case I'm at the top of my line for the components I use so cable pricing is a separate decision.
I did pull the trigger for the top offering from Cerious Technologies just for the speaker cables. CT only offers two lines, their value priced but very nice cables, and cost no object using all the skills the designer has, for those who like his approach and can spend more. There are two long threads here, one for each of CT's offerings.
The speaker cables make the best impact of all the cable types I use and it is a wonderful contributor to my rig. The rest are very fine cables on their own but I couldn't justify quadrupling the cost on those, despite a 100% trade up policy. I do have a governor on my wallet. LOL