hi there, i looked at this because i'm currently repairing my gearbox at the min, and to be ohnist i was having a nosey lol.
But on a up note i didnt realise that oceanic green was a sort after paint colour, as thats what mine is

am dead chuffed to find this out lol.
oh and about the box ive managed to grab myself a bargain of a box for 50 quid, but normally i think your looking at 200-250 plus depending on the condition, milage traveled etc. plus labour plus your clutch!! i'd ring round a few garages and get a few different quotes b4 u go ahead.
also i dont know what peoples feeling on clutch kits are on here and flywheels but mine had a dual mast in, which i have just replaced today with a solid flywheel conversion, (was much cheaper and by all accounts the fly wheels are prone to failure). yours might not have a dual mast in it, as you cant tell till you get in there apparently.