What kind of rope for anchor trolley

I am working on fabricating an anchor trolley system for my lovely new BK Prowler.  My first fishing trip went great (no wind), the second trip was good but I quickly realized how nice an anchor would be (little more wind on second trip)!

I am wondering what kind of line/rope (maybe this is a strange question) you guys use for the trolley line itself.  The things I've been reading on it mention using a "low stretch" rope for the line.  That makes sense to me but I'm not much of a rope expert.

Any suggestions?  If you think this is a stupid question and that rope is just rope you can tell me that too! 

I used the black poly rope that came with my Hobie's anchor (the folks at Hobie apparently thought folks would like to hang an anchor off the nose of their kayak).  It is working ok, but it soaks up a lot of water.

I'd either use something like the yellow woven nylon anchor line (doesn't absorb much water), or good old army-surplus style 550 parachute cord (small diameter and incredibly strong).

I've heard it is a good idea to install bungee cords on either end of your trolly system, to help absorb the shock of the wind shifting your boat around suddenly, or big boat wakes.  I set mine up with stainless eyes loops near the bow and stern, then a short section (maybe 5") of doubled bungee cord, a cheap stainless harken pulley taken off a key ring ($7 bucks each at West Marine rather than $12 for the same thing sans key chain), then my rope.  I use a wide-gate aluminum climbing carabiner to clip my anchor line into the system.

Mine is similar to this (less the fancy cam cleats):

http://www.anglersafloat.co.uk/Prowler_AnchorTrolley.htm

One thing I am thinking about doing with my system is shortening it up so that it runs from roughly mid-boat down to the back (rather than the entire length).  I can't imagine why I'd want to anchor from the front and face away from my lines.  Plus, the long trolley rope vibrates annoyingly at highway speeds on the top of my rig.

Haa how about that!  I was looking at the same setup you put the link in there for!  I was leaning towards the 550 cord myself.  Thank you for the input.

 I use the shock chord from front to back. Quick release at the middle so I can detach fast. Pics are here somewhere in rigging I think. I have them so I can take 'em off the boat pretty easy, no funny noises enroute this way!
 You definately want some shock chord, at least 2' or the "jerk" will get to you after a short time.
 Be Safe

Ok here I come again claiming to have invented the wheel     but,,,
long long ago in a forum far far away,,  Okay, Tstubb in Spike's Florida board posted it at the same time and I use a slightly different variation anyway.

On the new Hobie I used 5/16 bungie rope (?) and I ran it all the way around the boat and lead it through the grab handle eyes.  It's actually 2 lines that are a couple feet longer than the boat. I tied a cheap carabineer to the end of each line, and then led one line through the bow eye and the other line though the stern eye. Then I tied the line to the other carabineer leaving one in the front and one in the back.  When you slide the line through the eyes, the front bineer comes back and the rear one goes forward.  Now you can clip your anchor line into one or the other bineer and adjust your drift or anchor position anywhere on either side from bow to stern. I use a gripper cleat to secure both the anchor and the trolley. I also use the trolley line as a deck line to clip any leashes to (rod, paddle, net,,,).  I’d  post some pic but I keep wrecking my cameras  . Sounds like lots of lines, but I have not been too tangled yet. I also ALWAYS have a very sharp serrated knife on my vest and at hand.

The bungie rope is new to me.  Previously, I used 5/16 yacht braid, but I could not find any in black.  So I ended up with that stuff. I think I like it better. I got it at Fisherman’s Marine.