The dagenham is awful...
What about a T5? Yes its not a 4speed, although you could get the T4 4spd version of said T5.
T5s are still easily found, you can run a higher axle ratio and get the economy of the OD 5th if you want it.
My first guess for you, aside from T5 would be the SROD; but make sure you match 1st gear to your axle ratio of choice.