If I had to do it over..I'd skip right to a PTW. Then I'd do up a mosfet/ECU V3 AEG (e.g. KA Galil). Then I'd lust after an Inokatsu LMG (240/60/249...they're all good)....lust because I don't want to store it, just use one now and then.
Then I'd switch to a GBBR for any shooting where the temp was over 15deg C and not touch my electric guns.
Skip right to the end...