I say it's depends on what you want to do whether it's cqb or open/woodland.
If it's cqb I would suggest a spring shotgun or a g&g/jg/Cyma.
A spring shotgun is relatively cheap, light and has the cqb range and the cartridge mags are very small to carry.
I just bought an asg franchi sas 12 shorty with 6 extra shells and an s thunder grenade pistol & 3 grenades for room clearance for less than an AEG with 2 batteries, charger and a few mags.
I would say that if you aren't that physically strong, some spring shotguns can be awkward to cock.