I bought a retro around Easter of 2012. Spend about half my time in the VA mtns along the NC border. Retro does fine in the mountains on any road I've pointed it at. Dirt or gravel just fine. Twisty roads, hills, BRP - no problems.
Ural is slow but will plod anywhere. Great on the BRP and for sightseeing off the beaten path. Great cargo capacity. Ideal picnic machine. Some say the Retro is the fast one in the family - hard to believe. I've enjoyed owning it and have no regrets.
Occasionally I wonder if the 2wd would be any more fun in the woods, then I realize how little assistance I really need to get in over my head.
Only farkle I bought was a luggage rack, bit of overkill but handy when two of us go off for a day picnicking - sorta like the Clampett family. Ride it for a couple of months and get to know it before spending money on it. Check out Soviet Steeds for owners info.