Sorry for the delay in responding - I've been off on vacation.
BirdsEye and Northwest Topos work well together, with the line and point data from Northwest Topos displaying on top of the imagery (while area data is layered beneath as you would want, otherwise parks and lakes, etc. would cover up the imagery). I've attached a screenshot from Basecamp so you can get an idea of what it looks like.
Geocaches loaded also appear on top of the imagery.