I'm starting to lean towards trying to find a used LED that pushes true 600 Watts and at least 1100 PPF. I don't want to miss out on the benefits of LED. My budget for my initial equipment buy was to try to stay under $500, and I'm already $100-in with the tent I bought yesterday.
I've read where some that have went with HPS have had fire hazards from them running hot, and a few hundred bucks isn't worth the added concern about that, plus the energy savings are very attractive as well.
I understand that it's a trade-off economically, comparing HPS vs LED, so finding a used LED at the desired specs seems like my best move for right now.
I ran HPS lights for a long time, and being a "fire hazard" is BS, if it was a fire hazard, more than likely it was user error.
Around here you can get a dimmable digital ballast HPS setup used for around $55- $65 on FB Marketplace, buy a new bulb and your ready to go. Since you are already "over budget" and being your 1st grow, personally I would opt for the HPS until you get some grow time under your feet, then delve into the LED lights. Running a 600 watt LED and a 600 watt HPS is 600 watts no matter how you look at it, power cost and consumption will be the same.
I wouldn't consider a used LED, you have no idea how it was run, or its overall condition, and no warranty.
Used HPS your in the same boat, but bulbs are inexpensive and the price for a used ballast and hood won't hurt your budget as much as an LED.