well to be honest this depends on what you have planned for the car... do you plan to get 400rwhp or just a daily driver with basic upgrades
if just the daily driver with basic upgrades (300rwhp).. then a stock hg & arps will be fine... check that they torque it to 72ft lbs and you shouldn't have a problem... for the added safety of a 12mth warranty on the hg i would take that path
you can always blow up your engine 2years later or something and learn how to do the mhg yourself hehe... there's plenty of help around and if you do decide to blow it up :P make sure you don't take any shortcuts when building the engine