Welcome to AOA Forums, Ender! All PC gear goes obsolete. Staying at the bleeding edge costs a hell of a lot of money. Waiting six months to buy what is hot right now is a good policy--with the added benefit of you are not being a
crash test dummy while you wait for the manufacturer to fix the faults like they should have before marketing the piece of gear that is trying your patience.
You might start with the processor that you want, err, can afford. This leads next to a good mainboard for it. Call me old fashioned for buying somewhat expensive motherboards. Every cheap mobo I've bought other than ECS K7S5A's went down the garbage chute.
Count on needing at least a 400W Power Supply Unit. Don't Cheap Charlie this! Good quality
PSU's aren't cheap--but the idea of running a box with the Power Supply that comes with a cheap ATX case is beneath contempt.
Hopefully, this will get you started.