Im ot understanding what you mean by just as good. Are you looking to be able to support more power or do you jsut want a bigger turbo. If you dont need a bigger turbo you are not going to gain anything but lag.
The next step in turbos is the 60 Series. You can get these with a T3 turbine and it will botl right up to whatever kit you have. The only slight modification you may need to make is the inlet for these turbos are nearly 4". You can get a Hi-Fi version that will bring it down to around 3" if thats a problem in your set up.
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