Please point me to a good ROM

Hey guys, I have a Huawei Ascend P7, but I never got an update since when I got it. It's on P7-L10V100R001C00B158 since like forever! Still on EMUI 2.3 and the system is starting to show age, I want to update to a newer/better ROM, but I don't know which one is the best out there, and I don't know how to install a ROM, I've never done it before. So if anyone would be kind enough to point me to the right direction?

Thanks