agreed, bbenny - I have also been thinking long and hard about my setup. My thoughts have varied from fitting a RB26 or RB25, to getting a bigger turbo for my RB20 etc.
I have decided to optimise what I have, and enjoy it.
My setup is very similar to yours (bolt on turbo, stock ecu re-chip etc) and I'd reckon injectors and programmable ecu would be the way to go, then cams etc.
Those turbos are hard to beat on a bolt on Rb20 setup, with programable ecu, injectors (GTR or similar) and maybe some cams to go with your cam gears, there is no reason you cannot get to 240rwkw. The best part about optimisin what you have is you don't have to pay for a new turbo, and everything will be working to its full potential
If you where going to rebuild the motor, port the head etc, it would make sense to get a turbo more suitable to the potential of the rebuilt motor
If you are going to keep the motor stock, and whack a set of cams and injectors in, spend the money on a ecu and make the most of what you already have - it would be a awesome package, with great average power rather than a huge last 1500rpm
Would be a heap of fun and be really respponsive and thats what its all about I reckon
Chris