I'd buy two wings if you're out in the boonies, but if you're in, say, Capella, I would put big money on Corvette or Destroyer presence at all times. The simple reason being that there is literally nothing of greater strategic value in any system beyond that jump node except for perhaps shipyards, and then only for select systems.
The problem with that is most of the core systems have 3 jump nodes so that's 2/3 corvettes per system and i count 11 that I would consider a core system, one of which has 4 nodes so that's 34 corvettes and or destroyers tied up on node duty before you consider Installations / planets / ship yards that warrant protection and patrols into minor systems like Gamma Draconis
Delta Serpentis - formally GTA capital post sol node collapse so probably has a significant population as judging by the accepted node map would have been the first colonised system. also probably has a moral component to its importance with it being the launch system for the attack against the Lucifer and being the site of the old subspace node to sol.
Beta Aquilae - capital of GTVA space
Sirius - connection point for several jump corridors
Alpha Centauri - the jump nodes are close together allowing for rapid transit. also makes the system very hard to defend if attacked from more than 1 direction
Deneb - indications are that the system is quite heavily populated
Vasuda - Vasudan home system and could still be heavily populated
Antares - 4 jump nodes in and out of the system including Vasuda and Beta Aquilae
Vega - Home of the 4th fleet and site of a lab conducting meson research, which suggests the system might be heavily populated.
Capella - Known to be heavily populated and one of only two transit routes to the fringes of GTVA space
Regulus - one of only two transit routes to the fringes of GTVA space
Polaris - known to have a shipyard and presumably well populated
also but non core I would want to heavily defend Ross 128 at least until I know where the first Shivan fleet came from
I'd put a corvette on the last-but-one explored systems node, and send patrols to the last explored system. Why? The Vigilant was in the "last" explores system (meaning the one we didn't map yet, like is we didn't know how many nodes and where lead out of it) and it got shock-jumped by shivns when they arrived, because we had no intel on what are they doing beyong Gamma Draconis. If the vigilat was at the Capella side of cap-GD node and only fighter patrols were at GD, the vigilant would have recieved a message from this patrol that shivans are coming and prepare for the attack, like calling bombers for support. I am fairly confident that the internal nodes are not as much in need of guard in a peace time, because the fleets in the system patrol around all possible targets, and pirates hardly ever attack through the node into another system. In the war time, hwever, guard all nodes.
The Vigilant was jumped in a system that had been scientifically explored and the command brief suggested though didnt say that the science mission should have detected any active nodes. the nebula node came to be because Bosh sent the Trinity to activate the Knossos and scout it out