For $250 I don't see how you can go wrong for a power supply, so long as it gives enough amperage at a decent duty cycle. (You're going to spend >$250 just for a decent WC torch alone, and then you're going to need a cooler, and a gas bottle, and a regulator/flowmeter, an HF box if it doesn't have one, tungstens, collets, collet bodies, ceramic cups, fillers, etc etc) Not familiar with that particular welder, but I've seen other Aircos that were just rebadged Millers (including 330A/BPs) and they welded great, and will likely still be welding decades after the garbage inverters of today have given up their smoke.
Most of the knobs, dials, switches, sliders, buttons, bells, beepers and blinking lights on the modern Chinese disposable welders are essentially worthless, and not worth their weight in smoke. Seriously, there isn't that much TO a tig welder. I'd rather have one with fewer knobs, dials, switches, sliders, buttons, bells, beepers and blinking lights to burn out – but better, bulletproof guts underneath – than some underpowered Pachinko POS that lasts a few years before it smokes or you finally just toss it out of frustration.
A friend of mine has that same Lincoln 300/300 mentioned above and it is a beast. It's just a straight sine wave machine, but I've seen him weld some HEAVY aluminum with it and it does a nice job and just keeps chugging along...