Get a Type R tranny! Get either a Civic Type R, or a 96-97 spec ITR, then add a 4.8 final drive. Plus, you'll have LSD! Those two trannies have quicker 4th and 5th gears compared to a JDM 98 spec ITR tranny. With the addtion of the 98spec ITR 4.8 final over the 96-97 4.4 final, you'll have much better acceleration than a stock 98 iTR tranny because of the quicker 4th and 5th combined with the newer final drive.
You can find one of those trannies used for around $900, plus $300 for the new final drive.
The main thing is you'll have greatly improved performance out of this mod.