Don't think of CYMA aks as "low end". They are inexpensive, and you get good quality for what you pay for. I own 6 aks 3 of them are CYMA. They have all been gamed heavily for a few seasons but only one (my first gun) has required repairs. I upgraded the shit out of it, and now I use it as my primary and keep the Realsword as my backup.
Stay away from ICS. They perform well, but take proprietary parts, so you are screwed out of some upgrade.
If you like the AK platform then go with CYMA. If you like m4 then it seems like KA is the good choice.
Stabface Custom Embroidery