It may be worth you doing some research on components and the different levels from different brands. That being both the running gear and the forks.
At your price point there probably isn't much difference in the alloy frame quality from fairly (not really cheap) cheap bikes right up to those towards the top of your budget. Going from there you will start to see bikes that offer more bang for buck than others.
Just keep in mind that even basic level components will be more than fine if you're just starting out. You won't really know what matters more until you just get out there and ride. Get a bike, work out what you like or don't like about your bike over time and work out what sort of riding you like to do. Then plot your course to your next investment. Because if you take to riding, that "next investment" is pretty much inevitable