I dont doubt Miller, Hobart, Lincoln, but your partly paying for name; partly for parts support, and likely a longer service life. For most people, a welder that will do more than 50# of rods or 100# of wire in its life is fine. Production shops, that's different; one of those might be asked to do 1000s of pounds of rods.
Couple hints; spend the money saved on the "box" on things like clamps, a "bar stool" height work bench, extra wire/rods, and a cheap, but not the Cheapest, auto dark helmet. I like MIG gloves for arc, as you have good movement; cotton/denim long sleeve pants, close toe leather boots/shoes, and atleast "should" have long sleeve cotton shirt. We have all probably welded in boxers and flip flops (or atleast I have), but slag/splatter in a flip flop/croc makes holding the bead hard.
Grinders; I have and like a Rigid 18V cordless, but there is no replacement for a proper plug in one too; I like Makita.
Rods/wire, and practice. Here's my thought; I'll take a guy with a HF/Amazon multi process machine, that's ran 25# of wire/rod over a guy that spent everything in a Miller, and didn't have money to practice.
Once you get it; play with it; weld some bolts to plates; do some butt joints, some lap joints, and don't worry about some of it being ugly