89 mustang AOD to 5-speed Swap...Help please!!!

Im new to the forum and I was hoping to get some peoples feedback. I have a 89 GT in perfect conditon but my AOD tranny is blown. I was thinking of swaping the AOD to put a 5-speed in. Was wondering what everyones opinion was, should I keep it AOD or make it 5-speed manuel and if I swaped it what tranny would you recommend.

Thanks, Tom

Thanks for the info...I desided to go ahead to swap in the 5-speed. Im going to go with the tremec tko 500. do i need to change the computer? from what ive read some recommend that you leave it. someone also told me something about hearing a pinging noise or something like that, does that sound right? and how is the shifter on the tko 500 is it any good or should i put a new one on? i also heard that the 5-speed is harder on the car and it could tear some stuff apart on the car like the torque box. is there anything i need to do with that. If theres anything else I should no i would appreciate it...Thanks