My ultimate goal is to get on with one of the legacies
...while I do have over 1000 hrs TPIC none of it is 121..,
Do you have ANY 121 time? If you have 1000 121 SIC time, probably no big deal. But your odds of getting a legacy with no 121 experience at all, or even getting your app pulled for an interview, are NOT good.
The extra type rating is a nice to have square filler but I think the 121 square counts more in the scoring, all other things being equal.