Best return for the money, system upgrade suggestions please.


Hello!
I have managed to save some money that I do not intend to use to pay down student loans! I managed to save almost 2K and would like some advice as to where the money would be best spent. Here is my system below, thanks!

Amp - Integrated Krell Vanguard
Speakers - Sonus Faber Electa's
CDP - Cambridge AZURE 840C
SACD - Sony SCD C2000ES
DAC - Cambridge DacMagic Plus with BT dongle
Tuner - Luxman T117
Speaker Cable - Audioquest Type 4
IC's - Kimber Silver Streak throughout
Dedicated/Isolated 20 amp AC line with a PS Audio outlet
grm
Hello again!
I accidentally failed to mention another component in my system, a Sunfire HRS series Sub-woofer.

Thank you again for any and all suggestions! 
Yes, I have received that advice from many! However, just about all of the money I have earned or received as a gift has been either invested or used to pay down my loans, I would like to do something nice for myself. I am not necessarily looking to spend all of this savings, it's not burning a hole in my pocket, but maybe there is something out there for say, $200 I'm missing out on, that is why I am looking for some help.

I do thank you though for your thoughts.