I'd vote no on the 925. It runs on parts that are almost 3 years old (specifically, the SoC). Then again, the early-2012 SoC in the 925 beat out the 830's PoS Snapdragon 400 in benchmarks, so when you consider cost, I'd say that the 925 is a much better choice than the 830, unless you HAVE to have the wireless charging and SensorCore.
At this point, your best bet it to wait and hope for a legitimate flagship around Build in April. The only high-end Windows Phone devices on the market right now are the 930/Icon (outdated by about a year, no Glance, complaints about battery/heat issues), the 1520 (larger than most like, glass might be more-prone to cracking than smaller devices, similarly close to being outdated), and the One (M8) for Windows (a Frankenstein's Monster of a device, where the navigation buttons are on-screen and there is no camera button, plus you won't get Lumia firmware).
There's just nothing on the market worth a purchase right now. However, if cost is a big factor, a 920/925 wouldn't be a terrible purchase, as the 830 is about $150 more expensive than it should be, and we don't have a proper flagship alternative from 2013 as a step up from the 920/925.