Cyma Ak's are cracking guns, rock solid, pretty good internals, absoloute work horse guns. However they WILL be hot out of the box, most fire at around 400fps, so you will need to do a spring downgrade, or get the shop to do it for you for about £20. Will take any mags you throw at them.
Dhboys/Kalesh, different company than cyma, again pretty rock solid ak's, can be hard to get at the moment though
SRC gen3's are ###### good, however don't know much about their ak's. They can be a bit picky with magazines though, which may be a consideration (had a g36 that was a bit picky with mags, and I know their mp5's are as well)
Real Sword type 56's are great guns, made to the exact spec of real AK's (well 56's, the chinese version) and are solid as a rock.
G&G are supposed to be good, but have also heard issues with them
ICS are also supposed to be good, but again have also heard issues
VFC are supposed to be cracking guns as well.
If I was to buy another AK, it would depend upon my budget.
£200, I would buy a Cyma and a bucket of mags without hesitation
£300, I would buy a RS type 56 of some sort.
£500, I would buy two cyma's, mags and have plenty of cash left over for all my kit.
As an aside, I have owned Dohboy/Kalesh AK105, cyma beta spetz(2 of 'em), cm022 (ak47), cm050 (rpk), SRC gen1 rpk,