First I think you need to identify what in particular you'd like to improve with new cables. This would also help greatly with recommendations here by the way. Then use reviews to help narrow down your search to those products that tend to have the characteristics you're looking for. If you can read through the hype you typically find in reviews there are usually some useful comments and comparisons to other products that can clue you in to the primary characteristics of a particular cable. That and recommendations you get here (again, after you give us an idea of what you're looking for) should net you at least a few finalists to try.
The cheapest way is, as mentioned above, to buy used to try the cables you're interested in. The good thing is cables are cheap to ship and are low risk of being damaged in transport so they lend themselves to buying used. There are also several manufacturers who sell direct with liberal trial periods that could also be worth exploring if they seem to do what you want.
Last thought is that you should also let us know what cables you're currently using so we know what you're current reference is.
The cheapest way is, as mentioned above, to buy used to try the cables you're interested in. The good thing is cables are cheap to ship and are low risk of being damaged in transport so they lend themselves to buying used. There are also several manufacturers who sell direct with liberal trial periods that could also be worth exploring if they seem to do what you want.
Last thought is that you should also let us know what cables you're currently using so we know what you're current reference is.