assuming all the hard parts ( gears, shafts and forks etc) are good. all u need is the basic rebuild kit, which includes bearings, synchros, rings and shims etc.
if u feel mechanically inclined enough to rebuild it, then give it a try. i myself didnt, i COULD have, but i didnt have all the tools and the time to do it, i had someone do it for me and i got a deal so i am happy lol
if going to go as far as spend over 1k, i wouldnt waste that much on a t5, i could opt for the tko or something.