Starting a system behind the screen game this weekend

I'm going to be running a game where all system elements including dice rolls, character sheets and all mechanics are handled by the GM behind the screen. The players will have a sheet to write down any items they might have and any notes they want to keep.

The point is to both raise my game when it comes to description and to provide an experience where the player's only traction comes in the form of saying what they do rather than ordering mechanics to use off their character sheet like it's a menu. What I'm going for is to emphasise this:

1 - GM describes a situation
2 - Players describe what their charactes do in response to the situation
3 - GM uses the system when needed and tells the results
4 - Go to 1 and with the resultant situation

I'm going to go with a rules light system and am leaning towards some form of Microlite. My default rules of choice is some form of d100 like Call of Cthulhu or BRP, but since this is going to be a description only dungeon crawl, I'm leaning more towards something like early D&D.

I'll go into the premise behind the game in a future post, but for now I'd just like to ask for your opinions and input. Have you played in a game like this? Ran one? Any advice?

Starting a system behind the screen game this weekend