Should i make this trade?

I would if I were you. Tuuka is a backup anyway, and Duchene is an allstar caliber player. I would do it straight up. Reimer is looking good for the leafs, and you have both Capitals goalies at least, so you should be able to scrape all the wins they get with those two. You should trade one of your centers for a goalie with someone else if you can. You have 5 very good centers, and i'm sure somebody will trade a pretty good goalie away (that's better than Rask) for Bobby Ryan or Getzlaf (especially if they're on your bench).