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What are your preferences in multi line purfling? I'm leaning toward the fiber purfling for the finer lines and ease of use.

I generally use the laminated wood purfling from StewMac http://www.stewmac.com/Materials_and_Su ... fling.html or LMI. I think the LMI purfling may be of slightly better quality, but it's not enough to worry about.
I've not found it particularly difficult to work with.

I get mine made from Gurian Instruments
if your doing side purfling you need to bend it to make it easier to use. I bend this in my bending machine pinched between the bindings.

I've pre-bent purfling by first cutting a channel in a piece of plywood that is the curve I want to bend the purfling to, then using a heat gun to heat the purfling, starting at one end and gradually working the purfling into the channel.

Thank you very much for the tips. What is the most common size, .010, .020 or .030? Does anyone have some pics they would be willing to share with their size of choice. I'd love to see some of each. Thank you!

"It all depends" on the look you want. For instance, http://www.advancedshelltech.com/Images ... 00x350.png may have 0.010/0.020/0.010 B/W/B on either side of the abalone.
The stuff is pretty cheap. Buy a few sizes and experiment with possible combinations. I often make up a short 1" or 2" test section of a binding/purfling combination I'm thinking of using. I glue a scrap of top and a scrap of side to a block of wood, then rout the required binding and purfling channels and glue in the strips. That will let you see if the proportions are reasonable.

MaineGeezer says it all; this is a design consideration that is in the eye of the beholder. I do the same as the other guys routing a test with an inch or two all glued up. Then I glue up four binding strips with side purfling (racemic setup) and add top purfling all taped together with wood strips on either side to prevent twisting and then bend. Works like a charm. I've always used wood purfling up until my current project. Fiber has better white, but doesn't cut as nicely.

Search for "guitar purfling images" and you'll get more design ideas than you could ever use.

Thank you! I have searched a thousand and one images and come up with some good ideas. I still can't easily determine a multi line purfling size. Images and sizes would be awesome.

Has anyone tries the Purflex purfling?

Purflex purfling...yes. It's beautiful. It's expensive. It takes a lot of care to do a good installation. I used it on my second guitar. See "Cherry Parlor Guitar Project #2" viewtopic.php?f=48&t=7255 in Blog Your Project for the gory details.

A couple of things: The Purflex pattern is relatively thin, so you have to pay close attention to the depth of your grooves so you don't sand right through it or have a depression. After installing the Purflex, you fill it with black epoxy. Then you bring everything down to final height. I sanded it down. DON'T! Sanding created fine black dust that embedded itself in the grain of the top and made it look dirty. I had a heck of a time getting the top to look clean. If I were doing it again, I'd probably put a sealer coat of shellac on the bare wood, and I would chisel, then scrape, the Purflex to final height.