Help choosing an AEG

[Bobafett]

Hey guys Ive been researching ALOT about AEG's and Ive found some nice guns that seem good but I still need more help it feels like, I will be playing on a 10 acre Airsoft field and need to know what is a good first AEG that's not a piece of Sh!t but will still work well. Maybe you could list some guns under this criteria. I have a 500$ Budget. But if I have to spend a little more Im willing for a gun that will last me.

-Powerful
-Accurate
-Can shoot a target from 100ft+
-High ROF
-380-415 FPS
-Easy to find external and internal upgrades
-Has good stock internal parts and external parts so it doesn't break or have internal issues.

Ive been looking at SRC,ICS,CA,TM and KWA guns. The ones Ive taken interest in are :

ICS-
1. ICS M4 CQBR
Classic Army-
1. CA M15A4 SPC
2. CA Armalite CQB Compact
3. CA Armalite M15A4 CQB
Tokyo Marui-
1. TM SR-16
2. TM Thompson
KWA-
1. KWA KM4 SR5 2GX
2. KWA KM4 SR10 2GX
3. KWA KM4 SR7 DEVGRU
4. KWA M4A1
SRC-
1. SRC M4 SD
2. SRC M4 CQB
3. SRC HK416
4. SRC M4 R.I.S
5. SRC M4 Micro SD
6. SRC M4A1

[Short Round]

Kwa km4 sr10 2gx