New isn't always the best route. At the same time, buying used...you may end up with someone else's problem.
Double rifle education can be expensive if done after the purchase. You really need to know EXACTLY what you are getting and that's tough. It can take years to acquire the necessary knowledge about what actions work best, who makes them, how to know if there were problems in the past from just a picture...etc. Having a friend with such knowledge would be a big advantage in this area.
Not to mention the regulation process that will be required and range time to do proper testing. It's a big undertaking to have it done correctly. The best deals are from those that have done all this work and are giving up hunting with a DR and have something that you are looking for. I know there are a few AH members out there who may fall into that category.
If it were me, I'd start with my budget and go from there. Have some cartridges in mind but I wouldn't be too concerned about the difference between a 470NE and 500NE because the game is unlikely to know the difference. Better to concern yourself with the inner workings of the firearm and making sure it's safe and reliable...then if the gun is good, look at the cartridge it shoots to see if you are willing to commit to it.
Keep an eye out and best of luck to you.
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