MY Original TM HK51 bought in back in 91 Just recently overhauled and refurbished inside an out. Before the TM basher comes out how many clones can survived almost 18 years of abuse/crazy springs mod etc?. I still have the original progear mechbox for this aeg aside from a cracked body back in 97 and a progear box upgrade in 99 this has been relatively a stock unit until now.
For your answer to your question, if you want a shoot without problem out of a box performance then I recommend either a TM or King Arms but if you want a riced up version then a CA or G&P or even one of teh mentioned clones like cyma or JG.