just trying to decide which to get. don't have a lot of cash. a little scary of the 635 with only 512 ram for 50.00 hard ti be beat to get in with a windows phone.
If you can wait until Windows 10 comes out I recommend waiting for a true flagship phone instead of buying the L830. MS said that it will release a flagship phone with the release of W10. I think the L830 is a beautiful phone, but if your focus is Windows 10 you may want to wait or settle for a cheaper Lumia in the meantime. The L830 is on the more expensive side for midrange.
Edit: Or find a used L830 as Artur suggests