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I'd start with a CA or G&P M4.
Decide if you want a full stock (probably) or a collapsible stock.
The front end kit you listed is nice, I've installed one already on an SR25. The JP kit is nice as well.
I've put in several 6.03mm Madbull tightbores. No magic or mystery there...they work well. You must use good bbs...6.03 is getting pretty tight and mis-shapen bbs will jam. AK/M16 length inner barrels are easy to get.
I'd buy a G&P M120 Complete mechbox or Systema mechbox (although I think that they are overpriced for what you're getting comparably). And just reshim the G&P complete.
I'd use a KA Enhanced Hopup unit...just because they've worked well for me so far (installed/used about 10 or so).
With a tight setup with good solid compression...you'll be tickling the 440fps w/ 0.20g bbs range....plenty close enough to the 500fps MAX limit.
A stock TM EG1000, EG700 will pull it...but might not last long. A G&P M120 motor will work, a Guarder Infinite Torque Up motor will be really nice and a Systema Magnum is super-sweet.
That setup and a large 8.4v battery...and you'll be happy. BUT Start with a metal bodied M4 (not dboys) or you'll regret it when you're done the build. WARNING: Once you go metal...you can't go back.
Best of luck...have fun! (what's the min engagement distance for your 500fps max games?)
Tys
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