For a drive as long as yours (almost 1800'), I'd go with the 3PH snow blower. Even relatively light snows (6" or so) would take a while with a rear blade (which is what I use) by the time you make the multiple passes required. Also, since your drive is paved, that makes it much easier to use the blower.
As far as front weights, just use your loader...maybe have a load of sand in the bucket. You can also drop the sand off at some areas you may need extra traction for your vehicles.
Definitely go with the chains. It would be much less chance of sliding on the drive. Once those tires get impacted with snow, traction is going to lessen dramatically. Not fun on a steep slope. Turfs will load up much faster then ag tires, but a wet snow would give you problems with either type...might just take longer with the ag tire. By the way, if you do go with turfs, look in to getting bar-turf tires. Much more aggressive then regular turfs, but still pretty easy on the lawn. The picture shows the bar turf tires.
Biggest downside to any blower is getting the snow blown back at you by the wind. However, just dress accordingly (wear skier's goggles, hooded parka and good gloves). Of course, you'd have to drive in reverse. That's a bit of a pain in the neck...but not so bad if you takes breaks.
A new 60" snow blower is going to cost around $1200-$1500. Again, with your drive and even moderate snows; I think it would be a good investment.