Reasonable high end interconnects: without breaking the bank

For ultimate flexibility in choices (i.e., custom-made), try Douglasconnection.com .  Doug has various grades of raw cable to choose from, including Canare, Mogami, Furez, Furutech.  Same with connectors, including ETI, Vampire Wire, Furutech, etc.  Of course you can choose your own custom length.  There is detailed information about each product on his website, so you really know what you're getting.

I went the DIY route with his products, to save a few dollars, and because I like to tinker.  You can give Doug your budget and your specs, and he will come back with various options/combinations for you to select from.  I've done RCA and XLR interconnects from him, as well as power cables.  He also has digital coax and speaker cables.  Doug is a great guy to work with, and you really can't go wrong with any of his product offerings.

Darwin cables did it for me. Haven't given a thought about cables since I changed over to them
Yes, check their deals on their website. Highly recommended

I remember reading good things here about Duelund interconnects, $100-$200 budget if I'm remembering correctly.

Another vote for audio sensibility, just read all the knowledge in their Web, really good cables and prices 

I can also recommend Audio Sensibilty. I have two of his top power cords the Signature and they are really good with a full and smooth sound across the whole frequency spectrum. I read a revue of his top speaker cable and it is supposed to be just killer. I would bet that his interconnects are awfully good too. Stephen the owner is also a super nice guy to deal with and he offers 30 day free trial period!  Teo audio also has excellent interconnects and I would say even their least expensive model can compete with those from other manufacturers that are much more costly.  I actually use Teo Double Double Ultra which is a fantastic high end cable using the Schroeder Method, there is the thread here in the cable forum covering it, that is a wonderful cable that I probably wouldn't replace for a long time. Taras and Ken at Teo are very  nice and  knowledgable guys....I believe they still offer 30 day trial period too.