Where do I make the long run IC or speaker cable?

I would do the inverse.Short distance on low-level signal and longer where you have the added current/voltage,past the power amp.There has been numerous discussions on the benefit to damping with speaker cables of at least 6.5' and longer.Do the experiment and report your findings.I'm sure the cable manufacturer will be able to add their perspective.

I vote for short speaker cable, long interconnect.

As Tpsonic mentions though, you could check with a cable manufacturer, or even an preamp/amp manufacturer for that matter.

So far the count is 3 to 2
3 say short speaker wire
2 say short interconnect
Any one else like to share their experience?

I have three different sets of 10 meter ICs from pre to amp and 1.5 meter speaker cables. Speaker load is highly reactive as compared to the IC's load. So far, no dicernable problems with this arrangement. Especially if you're running balanced (as I am), I think long ICs are the slam dunk. For clarification, obvioulsy, I can employ only one of the three sets at any given time.

I have to ask how long is long? I've used both configurations with great results. What matters most is the cables used.