Setiawansr, while I was in the process of selecting cables for my system, I tried many... a great many. I found that buying on Audiogon and then re-selling the cables that didn't work in my system was the most cost effective choice. I rarely if ever lost money on a cable - most of the time it was the shipping cost that put it over the top or the $2.00 fee to re-sell on Audiogon. Hell... sometimes you can even MAKE money on a transaction.
While The Cable Company (www.fatwyre.com) does allow people to "rent" cables, their prices are generally higher than Audiogon prices and you still have to pay for shipping.
Audiogon is really the ultimate resource for buying/trying cables in every price range. The vast selection here on Audiogon BLOWS away the inventory at any audio dealer - anywhere! The personal "feedback" system on Audiogon helps to ensure you are working with honest people - it works and its very effective.
You will find that many of the Audiogon sellers are doing the exact thing you'll be doing - trying to find the right cables for a system.
Good luck and enjoy the journey!