Not the best doesn't mean you shouldn't consider it. AMD has pretty good value for its price. Assuming you're just looking to find parts I would wait for some stuff to go on sale if you want to build anything remotely decent for $400. Most importantly you should google often to see whether the parts you're looking at are compatible with each other (just google it and you'll find the answer most the time). Patience is key if you're trying to save money.
I would also save up for some dank bird stickers to pimp your pc case ye