Well, I know I wouldn't rush out and spend £1300 on a gearbox after breaking just one.

I got to the point where I was just buying up £50 gearboxes and building the gearsets into my casing. I have to say though, you pass another milestone at 280lb/ft (GENUINE) IMO. One where gearbox breaking goes up another level. Mine got so that I could barely take on an overtake without pulling the teeth off third gear!! LOL. 3 gearsets in about 1500 miles was pretty good going.