Well, I just got done bolting up my old school Green tonight. I had the Red many years ago when I still had a 2.0, great turbo, made a lot of power and was decent on the street. More recently I had the E316g with a 2.4. Crazy spool, made 350ish dynojet on pump gas, but not quite enough, so I picked up a Green. I was waiting for a sale on these things, but it never came, so I scored a nice deal on the old style one, freshly rebuilt by Justin. I've now almost completely duplicated the 2.4 Green setup I had in my Evo, which was the best combination I've ever had, just in a cheaper DSM package.
I'd put it this way, with the 2.3, if you want a great street car and around 400whp on pump, get the Green. If you want a weekend 10-second car with no intentions of turning the wheel at an event, get the Red. I would think the new style HTA Red with a 2.3 would spool about even with a 2.0 and the Green, but make another 100+horsepower.