As a factory turbo owner you'll want to upgrade the turbos diff anyway. They just single leg too much at this age.
Compression ratio, only a slight change from what I've seen, nothing to worry about.
On the N/A engine, keep boost around 7PSi on a free flowing exhaust, other wise you WILL hit R&R and ONLY run it on 98 fuel. GTS-t HATE 95 fuel (Experience here)
Braking department, it's a good opportunity to upgrade anyway.
Stock internals should hold easily with just stock /high flow on the side.
Longevity of a DE+T will all be about driver abuse. At the end of the day, rebuild it, and it'll be just as tough as a fully built DET
Edit: My opinion, keep the R33S2 GTS for a daily run around. Go and buy an R33 S1/2 GTS-t for cheap as, keep it as a weekend car.
The price that you pay for them now is basically nothing. Might as well get both. Then when the performer dies, you've still got a good daily.