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I have two edge scribe, and I like both of them, but I don't really use 'em much. The reason is that nowadays, I always just pull out my height guage and use it. I'd say if I were you, I'd get a height guage first. You can use it for many things including layout, edge scribing, checking symetry, etc. The guage has a carbide tip on the end so when you check your stock thickness and divide it in 1/2 (for centerline, or you can calculate for two lines to grind to, etc), all you have to do is set the guage to that, hold your knife flat, and slide the guage tip against the stock to mark your edge.
I love tools so I have a couple of edge scribes as well and use them some, but a height guage is more useful IMO.
--nathan