Amazon is going to have a massive sale in 2 weeks to celebrate their 20th anniversary. Could grab some pc hardware for the cheap.
Also don't be afraid to buy GPU's used. You can get a shitload of performance er dollar if you can take a mild risk.
Modular PSUs are the way to go, that way you're only putting wires you need. Get zip ties if you haven't. For case fanes either get Noctuas or Zalmans, the former are more expensive since they're imported but great quality in both cases.