I will stay with my 925 for now. It's a nice and proper phone, it is fast, it has a good battery life and camera and it's a Nokia. Now, unfortunately, it is sented out for warranty due to problems with my secondary microphone. I only have an old tiny Nokia 500 that I'm able to use now, so I really miss my 925. XD
I do admire the L930, it may be my next phone since it has very nice specs and a good design. I see it as a possible sucessor for my current 925. But I want to keep my 925 for at least a year from now, since I have had my Lumia 925 for only 6 months.
I don't know why people would ever pay 100 euros more for the L830, comparing it to the 730. It really doesn't have the advantages, like processing power, that the 820 had over the 720.