HDC Galaxy Alpha help with better ROM topic

Hi everyone, I recently bought an HDC Galaxy Alpha MTK6582 and I was well happy about the ay it is built, BUT sadly It is a Battery eater device and it has a VERY POOR reception in 3G and calling in general, now ..on my first test I did notice the battery drain quickly upon some test and so I found the only available ROM and flash it, but it seems this one to be the backup of the ROM in stock with the device, I don't know if any of you can help in find a better ROM or suitable one to improve the quality of this device as it often LAG unexpectedly.

Thank you