I used to be in this very same state of mind, but I got over it. You'll hear folks say "I can fly x amount of G motors for the cost of 1 I motor. Yes, but a G doesn't have the smoke or sound of an I motor. I COULD eat 10 cans of Vienna sausage for dinner, but I prefer one steak.
Here is an option:
150 bucks and your flying G through J. Don't want the 720 case? Sell it on here for below retail, it'll move fast.
Just think about this though. If you have multiple cases with only one set of closures what are you going to do if your rocket lands in a tree or pond or on a power line on the first flight? I had one land on a power line recently. But I had other cases to fly that day. Unfortunately my chute release was hanging there too, so that changed things too.
If you're considering buying a complete motor, opt for the 360. Yeah the loads are more expensive but you won't be buying a case you already have just to save a few bucks. And you may have one of those perfect days that begs you to put an I in your V2. I would definitely suggest grabbing a complete 38/360 motor, it has a wide range of propellants, H through I. It'll probably be only a few bucks more than the 240 motor.