If you are absolutely serious - embrace that this hobby is a series of long term strategies that require patients and knowledge. If you want the best bang for the buck, start by investing in Power, Power Power. Realize that $500 is not going to much of anything for you at this stage.
Take the $500 save it, start a fund so that you are making sage decisions on building a solid power delivery system. Power cables, power distributor - not conditioner, Interconnect cables and speaker cables. Once you have that set, then look to the components, speakers etc..
You will save significant amounts money by working from a position of strength. If you know you have great power feeding your system, the easier it will be for you to know which components / speaker etc. are the best for you in the long run. Enjoy your journey and have fun.