Hi Johnny, anything has got to be better than the standard CT20!
Most people looking for a cost effective turbo upgrade for the 3T-GTE tend to opt for the CT26 or a T28.
I am not too sure on how similar it is, but I have seen a TD04L (off a 99 Subaru WRX) go on a 4A-GTE that was good for around 200hp (150kw) at the wheels.
My choice for best value for money would be finding a good second hand T28 ball bearing turbo from a S15 200SX for less than $1000 (Australian). If you could get the Saab turbo for a lot less than that, it might be worth investigating the Saab TD04HL-15T further.
I hope this helps,
3T-GTE
(By the way, your post is entitled a 4T-GTE, was that just a typo, or do you actually have one of these extremely rare engines?)