Obx tsp or stainless power will run you under 800$ shipped which would leave you 700$ for a catback which is more than enough. Doug thorely catback= 499$ from southwest speed with plenty of vids. Flowmaster American thunder 569$ shipped via amazon, if you want to break your budget my about 100$ you could do any of the headers above married up with a stainless works catback or magnaflow.
Your budget is more then enough. also headers and catbacks are probably one of the easiest mods on these cars. There is no figuring out where things go, it's straight forward. Probably could install both if you are at all mechanically inclined in under 4 hours and that's with beer