Pulled the trigger on a SCAR 17

And now I need to know while I wait for it to show up, what accessories are must haves?

I grabbed up plenty of mags but thats it, what I'm considering is this:

1) Either an Eotech with a magnifier or a Trijicon Acog, but have no clue which one, I really like the chevron models and wanted a BDC but it doesn't look like anything will match up just right considering the barrel length
2) Fore end grip with bipod, need recommendations
3) Rail hand covers, magpul?
4) Pelican hard case, looking at the 1700, will that fit or do I need a 1720?
5) Anything else you guys think is a MUST have

thanks!
Adam