I got a reman Delco 140 amp for the SSEi. Cost was just above 100 for me thru the shop my mom does books for.
LOVE it. It'* a full reman, not like the avg ones. A lot of reman parts (especially alts) are only rebuilt where something failed, not necessarily everything, and cleaned up.
This sucker was basically a cleaned up case, and brand new everything. If you're running a lot of aftermarket stuff, like an amp, etc, the 140 will also last longer then a 105, because it will be strained less.