Aurora R4 PSU broken

Hello guys,

I've recently broken my 875W PSU in my Aurora R4. There is already quite a few posts about this but I'm still unsure on what I should do. I have no real need to upgrade and don't need a higher than 875W, but is it best to try and find the same replacement 875W or should i try and go for something a bit better like 1000W/1250W?

I have read that there is size issues, case fans and case lights compatibility issues when changing up the power supply.

I am not very experienced with stuff like this and from doing research I've found it a bit confusing and I would like to get experts opinions on this. 

Any suggestions are welcome, but mainly I just want some more information on the subject before I go ahead and buy something.

Thanks for your time.