Should I trade CC Sabathia and Ty Wigginton for Mark Teixara?

I'd definitely take it. You do have a fair amount of guys already eligible at 1B, but you get the much better end of the deal value wise here. Even if you don't need Tex, I don't think you can p. Tex is certainly a top 15 fantasy option among batters the rest of the way. He's easily one of the best 1B out there, currently on pace for 48 HR, 124 RBI, and 99 runs. His batting average has been a bit down this season, but his track record shows better days in that department are ahead. Your pitching does take a slight hit with CC gone, but you do have the depth to absorb the loss. Additionally, by trading for Tex, you'd be able to shop around Zobrist or Sanchez for a starter as compensation for losing Sabathia.