Jimx,
Mate after speaking with SSS Automotive (I have the same problem) He recommended a place in Sydney that can redo your synchros for $1500.00 or what they are doing at the moment is rebuilding the RB25 gearbox with the RB26 Gears and synchros. So basically you will have a Taller first and a lot better ratios into 2nd 3rd and 4th, this was around $2,500.00 to do. Which is really not too bad. Especially when you smoke a GTR off the line