Actually, a very deep amp from front to back or speakers that are about 20ft deep should solve your delima nicely!
Sorry, couldn't resit.
You'll probably get answers from both camps here. My experience tells me 9 times out of 10 short speaker cables, longer I/Cs. Reason: Long I/Cs are typically being driven by an active source typically feeding an active load. With speaker cables, they are driven by an active source (the Amp) feeding a passive load (the speakers).
Hope that helps a bit Icsi.
Regards,
Robert