Well I picked 501m+ But honestly like other people have been saying 1b+ is rich now a day's.
This is why I think this: I played RS for like 4 years. I quit and came back like 10 times and each time I dropped all my items and restarted fresh (dumb, tell me about it!) The last time I came back which was like a year and half ago I had about 20 mil in runes/pot/armour etc. It took me 2 months of um like 3-6 hours a day roughly to make it to 300mil worth. (Pic is in my profile I sold this account-lvl 121/131) The like 280m I made in that little time was only an estimate because I spend over 50 mil to get all my stats to 70+ etc. So if your a high level 500mil really isn't nothing. 2 d claw drops a week x 6 months = 1.4b? ezzz