G'day, How long is a Chinaman, or maybe a piece of string. There are too many answers, but it's a question I'm sure we've all heard many times.
I'd advise you to be careful. Watch a ton of YouTube reviews of Quadcopters. Watch out for those where the presenter was presented with a freebie. Their reviews can tend to be a little (a lot) biased. Look out for those who give glowing reports on a specific quad when the majority report it as rubbish. Try to stick to a recognized brand, one which offers a genuine warranty and parts are freely available.
The easiest answer would be, "BUY A DJI" but they are expensive and can suffer problems like any tech. If you have the money I'd still advise you to go for a middle of the road quad. Believe it or not many people buy their first beast and after a couple of flights they discover it's not what they thought it would be. Sadly many of these people tend to think flying is dead easy and a quad with all the bells and whistles won't crash. Some people simply can't operate today's technology, so a lot of that money is down the drain.
Also be careful with Chinese advertising of quadcopters. China doesn't have Retail laws or advertising laws such as "Truth In Advertising" Let's just say their claims can be over the top and at times are downright lies. If you can't afford a reasonable quad I suggest you hold off until you've saved enough. Nothing better to put a newbie off flying for life than to buy a cheapie and have it become attracted to a slab of concrete because the quad lost contact with the controller.
One quad which has had good reviews lately is the Potensic Atom. I purchased one a few weeks ago, but I haven't flown it yet, so I can't give a personal nod.
You could buy a used quad and that's how I buy about 60% of my squadron. There are hundreds on Ebay which have flown a few times, but sometimes this can be lied about. To get value for money ask a friend or perhaps a friend of a friend, someone you can trust to help you find something suitable. If there's a flying club nearby, members are usually very helpful plus you may be able to see a number of quads flying. This could give you an idea of what's reliable.
If all that fails, and you've found something you like, ask here, there's a good chance a member owns what you're looking at and they will be happy to advise you.
Personally, I'd be looking for a good used unit. Sellers will happily show you a demo flight. If they won't walk away. I'm about to purchase a DJI Phantom 3 with goggles, carry case, 3 batteries, and 2 GoPro cameras. The complete package in great condition for only $300 AUD. about $200 US. It's an older machine, but it has very low airtime hours and it's been looked after. I don't really need it, I have 2 others, but at that price I couldn't refuse.
Good luck with your search, if you have any questions I'd be happy to help and If I can't help you I'm sure someone else will . Stu.