Warm, rich sounding interconnects?


My system is in flux at the moment with a Wadia Intuition 01 as preamp/amp/DAC bookshelf Tyler speakers and (horror of horrors) an iPhone with an Auris bluetooth connection for the current audio source. Since bluetooth at best sounds somewhat thin and tilted up on higher frequencies, it doesn’t play necessarily well with the Wadia which is great sounding overall but also can be on the revealing side.

I know I should get a better source - but even so I’ll always want the option of wireless in various situations. I’ve owned Purist Audio Museaus’s (rev-c’s) in the past, which would be perfect, but sadly sold them on A-gon some time ago. Those are hard to find and the newer Purist cables are brighter sounding.

So in a nutshell I’m looking for interconnects which will deepen and darken the sound for my current setup - and new/used for under $400. Any ideas?
monsignor
Personally, I equally dismiss $25 and $25k interconnects. Let's cut the guano, good cables cost at least hundreds new. If someone is capable of making them himself that's another story.
Next thing I know I will hear that there are great sounding $1k new speakers. 
MG Audio Design is my choice.  I first lerned about them from Arnie Nudell and later found out that his friend Paul McGowan also uses them.  As their cost is only $1600 for a one meter pair of their top of the line interconnects, $900 for a half meter pair, I am able to afford some of them.  Not having any experience with the super expensive stuff out there, I myself comment.  But I do know that they are far, far superior to a previous Audioquest $1800 pair of their previous Niagsra interconnects, plus my pair of Audience 24AUse  pair-their previous top of the line model.  Supposidly members of the Colorado Audio Society have themself compared them to Nordhost Osin II's, with very favorible results.  That is all I can say.  With Audio Research LS27, Rega Osiris integrated, Martin/Logsn speakers, I myself get incredible results using MG Audio Design interconncts.
Inna, been involved in high and ultra high end industry for nearly three decades selling systems in the hundreds of thousands most are wired with very inexpensive cables. Statements like above about cable prices only prove your limited experience!

It's easy spending other people's money but it's wasteful when it's not needed specially in this case that OP has a specific need, looking for somewhat of a band-aid.

David
I myself have fond MG Audio Design interconnects a great choice for the money.  I firsr learned about the thru comments made by Arnie Nudell in his review of an modified Oppo 105.  I tried them out and loved them.  I still cannot afford their one meter top of the line interconnects which go for $100 for a one meter pair.  But fortunatlu for me they srll half meter pairs for 900.  I later learned that Arnie's good friend Pat McGowan also uses MG Audio Design wires for his own system.  I have also read that a group of members from the Colorsdo Audio Society preferred them to the top of the line Nordhost interconnects during  demonstration.  I myself can not compare them to the big named competition, but I do think that they deserve looking into.  Do not judge them by their price.  And their mid level interconnects, at $1100 for a one meter pair is a truly best buy.
Some do report that, say, Mogami balanced cables perform very well in some systems. I think they are $100 1m pair or so.
My experience is limited but my hearing is good enough.