what i use to have was a OS.18 TZ(TX) engine what a 37x41 transmissiong gearing and a 19x23 clutch gearing. Thats the highest (or tallest) gearing ratio ou can get. simply put it was for top speed and i got it [X(] that thing was friggin fast.

But if you dont want that option it really comes down to two things. top speed vs accell. You can set your gearing up for top speed but you will lose some accell and visa-versa. BUT if you set the gears up for top speed and have a extremly powerful engine ( the TZ engine ) you will have plenty of power to pull of a super fast accell off the line and get great top end for top speeds.

the cheapest and maybe best option is just to change your gearing.