help me pick a tranny!!

im making in the 400's for both hp and tq as of now and im getting a new tranny... i dont know if i want a tko 500 or for another 100 bucks get the 600 but have to order a new clutch because the input shaft is 26spline on the 600.. also the gear ratios are different and the 500's are steaper but with the 600 i can get the .82 road race 5th gear... basically i think i may like the 1-4 gear ratios of the 500 but i may like the .82 5th gear i could get in the 600 , and with the 500 i can use my spec st3 clutch i already have... but for another 100 bucks ill have the 600 and be able to hold more power in the future.. and for some reason the i may like .82... lets hear some opinions

tko500......................tko 600
3.27.........................2.87
1.98.........................1.89
1.34.........................1.28
1.00.........................1.00
.68............................64 or .82

do you think the 500 would be faster in the 1/4 then the 600?

im think im gonna get the t56 magnum.... that way i have the road race 5th gear the tko600 would have plus the overdrive... this leaves me with a brand new frpp aluminum driveshaft and spec stage 3 clutch i wont be needing...