The 'clear' finish you plan to use may decide on your colour choice. Tru-Oil, (and other similar polymerising oils) is slightly yellow, and the more layers you add and the older the finish is, the more pronounced the yellow effect. So yellow and blue make green, so you can quickly get a green tinge to the finish if you Tru-Oil over a blue-stained guitar. Tru-Oil on red is generally fine, it just changes the tint a little bit towards the orange side of things.
So I'd use just poly, acrylic or another fully clear lacquer for a blue finish.
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