Personally I'd put faff injectors in for the moment, as they run happily on a standard 185 rail and you could drill it out to get more flow through, if needed.
Things you will need to consider with making a 2nd fuel rail, is the cost of the injectors, and the work involved. (Granted 2 lots of 440s may cost less than a single set of 900's) You could also plot a map that would only use 1 set of injectors should any go down, that way should it happen, the car will still work and buy you a bit more time before needing to sort out the problem.
I'm now thinking that the 2nd rail way may be the way forward, but then again unless you are trying for times on the drag strip like Pete, 800's on a single rail would probably be more than adequate for a rev 2 engine.
Now you have got me thinking about it, and how to fuel my crate, after upgrading the ECU and tubby.