Pretty sure Z1 sells new 6MTs for under $2K. If bearings and synchros cost $1K plus rebuild labor, there's no question in my mind that a whole new transmission is the better option.
And yes, there is a brand new 6MT posted up for $1500 local pick up in the FS section (I believe local is CA).
__________________
2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |