I suggest getting the Pro29 3-grain case. It has a lot of reloads available for it in the G to baby H range, and you can use spacers to get down to F's if you want to stay low. The prices are good, though not as low as Aerotech reloads.
Pro24 is intriguing, but I think that the bang per buck is less appealing... I kinda want to fly something really tiny on an F240, and there are all sorts of interesting motors (dual thrust, long-burn, green, pink) for the Pro24 6G case, but the cost is indeed fairly high for middling-sized G motors.
2013 impulse burned: 5205.1 Ns
2013 impulse lined up to burn: ~56,445 Ns