Originally Posted by MaciekA
Get the King Arms M4.
Don't get the Socom Gear and dont' get any G&P rifle at all. While they're cool guns, they are also money pits and/or either imperfect out of the box or downright defective, and you need a "smart" purchase right now.
I'm going to +1 this. Especially if the OP doesn't play very often and just wants something that is guaranteed to work pretty much all the time out of the box.
I'm actually a big fan of "Off the Shelf" stuff for most new players, especially if they don't have time to mess around with stuff. Hell I'm kind of trending towards that way too, I like messing around and tuning and stuff but at the same time I find I don't have as much time for that these days.