I'm thinking more like 32GB if you want have an App crazy cushion.
The OP (Aprilneo) may likely be on a budget, as many others are these days, and what you an I agree on is not easily attainable for others. I do feel however that when one shops for providers/affordable plans the internal memory of compatible phones is equally important in the equation these days. Most high end phones don't even have an external card slot anymore.
My suggestion to Aprilneo if at all possible:
Sell LG Volt on ebay and get whatever you can for it. Current listings are between $35-$55.00 to use this toward a new phone. Heck, with 20,000 followers you could try a FundMe!
Consider purchasing a
Motorola X Pure Edition MXPE 32GB model. This is a nice phone with exterior customization (build your own) and is $449 for the 32GB option. It currently comes with free shipping & added free 1 yr extended warranty (expires tomorrow 1/26). It is compatible with ALL service providers, so you could continue using it on Boost Mobile as long as you pull out their sim card and use it in your MXPE.
or switch to
Total Wireless (uses Verizon Network - better coverage) service provider. $35/mo unlimited talk/text/2.5GB data (optional $10 add-on 1.5GB carryover data backup card)
This would prevent you from getting frustrated by insufficient memory notifications for a while.