Nothing high end right now would meet your "not feel obsolete" requirement both the 1520 and the 930 have slightly dated hardware. The 830 will not have HD and more than likely not have 2GB in RAM as well. You might as well ride the storm out till 2015 or make do with a used Lumia 925 to tide you over or if you do not mind the form factor get a used 1520.3.
Just my two cents about high-end hardware and phones feeling obsolete:
My Lumia 920 still performs as it did 2 years ago. Exactly the same. In that sense, I wouldn't say it feels obsolete. Nowhere near.
Assume for now that the 830 has say SD800 and 720p - not the latest bleeding-edge specs now, so surely in 18 months time it'll be a dinosaur? But the specs race has changed in the last couple of years. We're at a point now where you don't need top-of-the-line numbers to get great performance, particularly with WP. SD800 and 720p would generally provide more than enough grunt to quite happily run anything you throw at it under normal day-to-day use, and high enough resolution that you can't discern individual pixels (at least not without really trying). So if the phone performs this well now - and still does in two years - what does it matter how recent or dated the hardware is? There's no reason it should feel obsolete as far as I can see, at least not within the next year or two (unless of course it developed a fault or whatever - different situation).
And I doubt WP9 will increase hardware requirements such that older hardware might perform less well - if anything we seem to be into an era of optmisation and efficiency improvements which mean that hardware requirements are as likely to drop as they are increase (think Win8 vs Win7). Also there shouldn't be any surprises around fundamentally unsupported hardware as we had during the WP7 => WP8 fiasco now WP8 is stable on the common Windows kernel.
What I'm getting at is there's the latest and greatest flagship device on the horizon. You can always be waiting for that next big thing - and let's face it, if having cutting-edge tech the second it's available is your priority, WP probably isn't the platform to be on. But what we do have is a platform that performs exceptionally well - perhaps better than any other - and more importantly that performance DOES NOT DEGRADE OVER TIME. So why spend your life waiting? Get something decent now and enjoy it, and theres no reason you won't still be enjoying it just as much this time next year.
Of course whether or not you might feel like your phone is obsolete from a mindset perspective because it's no longer one of the latest models is a different matter entirely, but I guess most people who think like that are buying iPhones ;o)
Plus as a side note, 1080p will only work the phone harder and chew more battery for almost no perceptible benefit as far as I can see. I think I'd actually rather have 720p, even at 5", and feel that I had that little bit more battery life. 5" at 720p is something like 294 PPI which I think is plenty - 441 PPI is overkill.
Rant over.