I would highly advice go for the G&G combat machine series as your first aeg because this one has good overall internals and can actually outperform most clone aeg out in the market. The G&G combat machine range from 140-210 and some actually have a blow-back feature. External are made of polymer plastic stronger and more durable than your typical JG or even Tokyo Marui body.
There also an airsoft gi variation of the combat machine they called it the g4 series, their models varied from standard m4 to a dmr. This model also have polymer body and some of it have brand name rails on it like Daniel Defense.
Both models does not come with a battery though so you have to purchase it separately, I would recommend using 9.6 mini type battery in this models to reach its optimal performance. I wouldn't recommend using lipo in this replica though
A good starter aeg should be i the echo 1 range, they are good quality and well built, but not as good as G&G and ARES guns, but it will suit you well, i own an Echo 1, an ak47 one, but if i were you get an echo 1 red star wolvarine, nice , very tactical, and very realistic, and lower the fps at a near store or just tell them to lower it down before shipping. And if youu dont have an airsoft place near your house have an backyard airsoft battle eith your friends if you have a big backyard like me.