What's the weakest link in my stereo set up? I live in a townhome, so limited on space.

OP,

I recommend DHLabs interconnects and cables as a reasonable cost quality interconnect. I have these around a quality connectors when I get a new piece of equipment and want to spend the first six months with the new component, getting it broken in and getting to know the sound. 

Blue jeans are budget interconnects ... low end, often marginally better or not at all than consumer. I tried them to see just to see how they sounded. I have nearly fifty years of experience in high end audio. You can see my systems under my user ID. Everyone's system is different so the impact on the sound quality is highly variable. The difference in high end wires increases as the sensitivity of your system goes up. Typically the rule of thumb is think of spending 10% or so the value of your system. More or less can be appropriate. 

If you are reading cable threads that 90% of the time say it snake oil. You are reading the wrong threads. This is categorically wrong. 

First off anyone who says cables don’t make a difference is because they dont have a system revealing enough to hear it. And if this is true about yours then definitely don’t waste your money. Focals are very revealing but Macintosh and Cambridge (and I’m a fan of what Cambridge does and offers for the price) however are right on that edge where cables may or may not matter for you, use your best judgment if you think your system is fully open as oppose to veiled. In my system I hear differences in every cable I’ve swapped. But let’s be honest, they are waaaaay over priced. I had my Silver XLRs hand made from a gentleman in Australia, I don’t know if he’s even around anymore. But I have a solution, make your own!!! Im making a pair for my subs bcs I couldn’t stomach spending another $1k on cables. Supplies cost about 200-300 and you couldn’t get this quality under several thousands from any manufacturers selling high end cables. Plenty of step by step videos on YT for making your own interconnects and speakers. Its alot easier than you realize. As far as power cables I’ve never tried swapping out or upgrading so my opinion isnt worth much other than I’m less optimistic on the effects of different power cords. Anyways hope this helps

@ghdprentice 

I took a look at DH. The prices are not terrible, but they have multiple cables for what type of sound you want. I am not that well versed in sound to know if I want ones that are warm, emphasis highs, etc.

I think cables are a water I shouldn't wade into without knowing what I'm doing.

So, if are talking about  speaker cable, for instance, the Q-10 looks like a good choice.

In general, your Focal speakers are going to be a little hot on the top end, so you don’t want to get too fast and detailed. I’d stay in the middle to warm and natural to make sure you get the most musical / natural sound out of your system.