Help with speaker cable recommendations please


Hello and thanks for reading!

I have a Krell Vanguard integrated rated at 200W @ 8 ohms and 400 @ 4 ohms. My speakers are Sonus Faber Electa's rated at 8 ohms with a suggested amp rating between 80W and 200W. The speaker cables I am currently using are Audioquest Type 4, a 15 foot pair and I believe they are approximately 15 gauge. I purchased the cables terminated from a dealer for just $170. These cables were meant to be a stepping stone until finances permit me to upgrade, the thing is, these cables sound great to me! What might I be missing out on with these cables vs something that would be a better fit for my system? I purchased these "stater cables" based on recommendations and reviews I have read. What cables would be the next logical upgrade in your opinion that are friendly on the wallet and make a significant improvement in SQ?

Thanks for your help!

grm
grm
1.Buy USED...
 While I have not demo'd many different choices I rolled the dice & bought used Nordost "Norse"series Red Dawn at about a 60% discount from retail & it really was like cleaning a dirty window..
 I will also say I would like to try some Upper end(retail about $2500.00)Cardas against say Nordost Heimdall 2's
I would avoid some of the bigger names like: Nordost, MIT, Synergistic, Transparent, Cardas, etc. Buying used was excellent advice however. I am very impressed with Inakustik cables and for lower dollars: Crimson and Analysis Plus. There is a newer company out there named Bionics Cables which uses some of the technology of Mosiac that is extremely  good. I have always thought that the smaller lesser known manufacturers made a much better product than the big boys.
No affiliation with - just a very satisfied consumer.
I use and love an entire loom of Audio Art Cable.  Dealer on here.
Strongly suggest an email or phone call to Rob Fritz @ Audio Art Cable as he is an outstanding guy to chat with and will never steer you wrong.  His entry level products perform well above their price class and it just gets better as you move up.  I have the classic series on up and it all has some serious sonic prowess and I say this having owned several AudioQuest cables as well.  

If you're  satisfied with the sound, don't  drive yourself nutty and lighten your wallet on this merry go round