Ditch the wife and take A, B....and C.
It sounds like you already have more bass gear than you really NEED, so go with the HDS, but don't pay 750....make sure you price match and get the US base map version (about 100-200 cheaper)....I've checked out the Insight vs. US basemaps and they are virtually identical for kayak fishing except the insight has some background shadows/color and the batho-lines. Although the batho-lines don't even really cover the that area most people fish in LJ. The Insight maps have a ton more options, but they are pretty much useless on the yak.
Use the extra skrilla to get the Go-pro and....