Two good turbos that will get you a good amount more power with out affecting response too much are:
RB25 turbo (non-neo because they are weak turbos using epoxy plastics for the compressor wheel which are known to fly apart when pushed).
VG30 roller bearing turbo which are a bit rare to find in good condition.
They are both ceramic exh. wheeled which plays a big part in quick spooling up times.
Steel exh. wheels are heavier and take more time to get spooling escpecially when the wheels are bigger, inturn creating more lag.
It all depends what you want at the end of the day really
response over power or
power over response