Welker = 70 points (about right?)
SJ = 282 points
combined = 352 points
CJ = 338 points
Gettis = 56 points
combined = 393 points.
Also, remember that CJ had 2 very bad games against 2 very strong run defenses. He put up numbers nearly equal to Welker and SJ combined on basically just 6 games. To me, I'd stick wit CJ and play the best WR available (check match-ups) ad come out better than SJ + Welker on most weeks. I would not make this trade.
This aint a NYC auto garage, if it aint broke, dont fix it.
12 team redraft: Rivers (Q1), CJ (R1), McFadden (R2), B Wells (R3), Caddy (R4), Forsett (R5), AJ (W1), Fitz (W2), Royal (W3), Sims-Walker (W4), V Jax (W5), V Davis (T1), Kaeding (K1), Jets (D1)