Running Shoe Help Please!?

So, I am a runner with low/no arch and have flat feet. I typically run on the tredmill and when its really nice out I run on the pavement. I am a distance runner. Which pair of ASICS running shoes is best for my foot type and running terrain? I was thinking about the ASICS GT-2130.....but I do not know if this is a good choice because I am retuning the shoes I got the other day because they just did not work out on the tredmill and were too heavy. I am also looking for a lightweight shoe by ASICS. Any suggestions will be great with specific models. thanks!