AM i better off getting an FMU / SFMU ($)?

IMO, the SFMU is one of the best FPR out there, esp when it comes to versatility, and fuel pressure adjustment. Being able to custom talior your fuel pressure curve rise rate by using different disks/ springs, is excellent. For 300 bucks, its not cheap, but it does whatever job you put to it. I dont know much about the AEM ones though..dont know anyone who uses them. Whatever you find, you must find one that you can adjust the rise rate to match whatever fuel injectors you will be using. Also be sure its a boost dependant rise rate FPR. Some are not meant to work with boost pressure.