Interconnects

Audioquest Earth XLR would be excellent, very reasonably priced, amazing sounding, interconnects for your application.  And you not feel the need to ever upgrade from there.  Buy used and save to make it all that much sweeter.  

Hey Roxy ~

First, congratz on your new gear!  I agree w/what a couple of posters above said, run your new gear w/your old cables for a while, say 2 or 3 months, and get really familiar w/what a few favorite tunes sound like thru that setup.  THEN, try replacing them w/an upgrade, and listening to those same tunes, listening for differences. I would suggest Synergistic Research Foundations, or one from the Cardas Clear line . I have both hooked up [in different systems] and can attest that they made an immediate and noticeable difference in SQ, esp in low end and overall detail.  I know, sounds counterintuitive that they could do both simultaneously, but it happened.  The SRs produced more detail but less of a difference in low-end, but the Cardas Clear are amazing [AND considerably more expensive] ~ the low end extension was so much better/fuller that I backed out of changing my amp!  But follow your ears, obviously...certain cables will pair better w/certain gear ~ but sticking to the tried-and-true brands, you will almost certainly hear a gain when you upgrade and spend a few dollars on cables.  Not saying that some of the the lesser known cables are not good, just that it's often "safer" to spend your extra $$$ on well known brands. 

And, just to make it clear, I am talking about ONLY upgrading the interconnects ~ all of mine are RCA, but of course that's a whole other conversation.

My suggestion would be to contact thecableco.com and borrow some cables. 
There will be a small fee which they will put towards a purchase. 
 

You’ll want to hear some different cables for comparisons to see what sounds best.