The Silky pole saw is one of the nicest out there. I have never used or owned the Silky version. I have a fiberglass version that I use but I also have separate pruning and saw head for the poles. I don't think the Silky can take a pruning head IIRC. Since you don't use the pruning portion, that should not be an issue.
It will not matter which blade you get IF the blades are interchangeable. I know they offer the blades in different lengths for the handsaws, I'm just not sure about the polesaws. I have a zubat hand saw that I really like.
You'll want the blade to be as stiff as possible. It helps prevent the blade from bending when it binds in the cut.
Great things about the Silky are that it is one of the lightest and stiffest poles out there. But anything that long is going to flex. The Silky blades are excellent. The extendable version is nice in that it quickly adjusts to the desired height.
Bad things are that the aluminum poles are not as sturdy as some folks hoped. Drops and bangs to the units have caused bent poles that could not be satisfactorily straightened (think bent retractable radio antenna). Also, if the clips that lock the extension poles in place break, they are not repairable. They are not rated for utility work (around electricity).
The above info is what I remember from doing research @3 years ago. Some of this may have changed in the meantime.
There were alot of happy folks using these though. Problems were with durability and not being able to repair a pricey piece of equipment.
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