A seahorse 720 with locks (direct) is $85, pretty roomy and relatively jet stream. Another member bought a 2014 with all 3 seahorse bags, or similar brand, and his bike looks the best equipped of all nice bikes here, imo. There are several here that have all 3 Seahorse bags, but I don't know about the saddle bag racks for the panniers (and I'm pretty happy with the top box only - fixed!)
Of course the rear AL SW rack was at least $185, and I think most pannier racks will work: but I'd be thinking AL and mounted as close to the bike for aerodynamics.
The Givi's do have good engineers, but they are still balloons. I'd never carry that much crap if I'm motorcycling: but everyone is different though.
Seahorse is cheap, sleek, waterproof sealed, and efficient storage. What more do you want?
And for groceries, I have a 40" x 14" DIA US Army Olive Drab duffel bag that carries up to 140 lbs (water gallons, juice, and 8-10 bags of groceries); and when on my back, rests on my back seat like a passenger
It doesn't get any better.