Just a quick thought. Lots of old school folks (and maybe some new schoolers too?) like the idea of GP=XP, as it spurs exploration and treasure hunting. Lots of old school folks dislike the idea that adventurers end up with literally tons and tons of gold by the time they hit name level (in my experience, the new schoolers have long since converted all that cash to magic items as they go).
So why not keep the standard XP for treasure brought successfully out of the dungeon, AND use the Arneson carousing rules, where you get XP for any monies wasted in drinking and wenching, or donated to a worthy cause, etc.?
It provides the players a bit more control over how fast they level up, gets rid of excess gold from the game, and speeds up advancement for groups that only meet every so often, as many of us on adult schedules do.