I really like option 1 the best because it helps bring in the RP experience through a somewhat organic player ran economy. Also higher prices, in my opinion, 20-30k is where I would like to see the guns placed. I think higher prices force players to value their lives more than being able to buy an entire loadout for 10k and just keep dying over and over again.
I really don't think option 3 should even be an option. Option 2 is kind of like a slightly better version of option 3. In my opinion, option 1 blows the other choices out of the water.