I had been going through the same process, I had my eyes on the Striker 4, managed to convince myself to spend the extra on 5 buuuuuuuuuttttttt now the 7 is looking the goer. Mainly for the wifi to my phone etc (gadget geek).
Yes I'm a geek too, I've discovered that Garmin Active Captain website (GACWeb) and Garmin Active Captain App (GACApp) and the 7sv are quite interoperational, but with codicils.
As for the Quick Draw tracks, they sync up and down for 7sv<> GACApp<> GACWeb - Okey Dokey
As for GPS points and routes, I'm told that most can go down hill to the device, GACWeb>GACApp>7sv . But Garmin support, reckons you can't send GPS points and routes uphill to the GACWeb. mmmm
I have also looked at the slightly cheaper Striker 7cv (I'm not sure how much use sidescan will be to me at this stage, but weighing up if the extra $100 is worth it or not.
I though that also, but then I realised how to read the side scan. So if I understand, all of what we see on the FFinder is past history, so we've got to turn around and go back to the fish, unless we are moving up current when the bait/lure will drift back to the fish. So the side scan means that I can be less precise about going back, as it gives a much wider area to go back to...
Main concern is having a 7inch finder on a kayak and the setup/mounting options? Would be keen to hear how you are going to mount it or if anyone else has a 7inch mounted on a Ultra 4.3 or similar, keen to see some photos etc.
Here's a photo of my Hummingbird in the 'yak, the wires go into the tackle box and the battery is in there and there's a transducer scupper in there too. with the transducer mounted in it, into a recess on the bottom of the 'yak.
So c/o photoshop I've worked out that I can fit the 7sv in the same spot.
Humminbird 19cm wide Garmin 7sv 24cm wide