Affordable speaker cable or.....

So I'm thrilled with my current setup which I spent much effort in terms if time and extra $ to create. Prima Luna prologue 2, el34eh, mullard fronts, audioart ic3 inter., music hall cd25 with kimber pk14 PC, monster spkr cable onix reference 1's in BEM. Right now as I'm not earning much$; I couldn't ask for much more. I'm in love... Is there an affordable speaker cable that would blow this systems top "for me". Or any other upgrade ideas are greatly appreciated! I've finally realize why we spend the time on aquiring great gear. It's so worth it!