if you ask me... pick either the AK47 or the MP5 and get it made from
TM or CA (if MP5 definitely CA. i dont know much about the CA AK47)
A very good gun to get started would be either a G36 or a G3, I own both and am quite satisfied with both. I did switch out the plastic on the G3 for metal which would not have been nescessary if I had gotten a CA version.
The Metal that you get with CA is worth it in my opinion. More durable, more realism. Feels less like a toy
.