Also factor in a new good quality front pipe, plus might as well change the dump pipes while the turbos are out, a 3 -1/2" exhaust or better, you might also find the ignition system isn't up to the task.
The way I would do it,
Ecu, front pipes and cat back, suspension, fuel pump and mantinance eg new ignition coils
Have it tuned At STANDARD boost on the stock turbos to make sure they live a while, whilst saving for the new turbos injectors, afm's etc