Trading Down in 1st/2nd Round

[Bengalstripes9]

I've been doing a bunch of mock drafts and it's rare that a player drops to the Bengals at 18.
Here and there I'll get a Corner or OT drop, and very rarely a WR.

What I find works best is if I trade down from 18 to attain the Cardinals pick 27 and pick 35.
We may have to give up our 2nd or lower picks to get it done.

But from that spot of having pick 27 and 35...

It's a guarantee to get Sweat at 35, and you can even trade down to pick 40 and get him and more picks.
If I don't trade at all and try to get Sweat at 49, I'm getting him 5% of the time at best.

At pick 27 I've had the following players fall:
Newton, Bowers, a few different OTs, Graham Barton

Having picks 27 and 35 is more valuable than having picks 18 and 49.
Pick 49 seems to miss out on our needs and I end up wanting to trade down anyway.

With picks 27 and 35, I can end up with Barton, Sweat, and the tackle from Yale at 80, then WR at the 3rd round comp and that is pretty good in my opinion.
It also allows the opportunity to take Newton, Sweat, OT, WR.
Or Bowers, Sweat, OT, WR.

I end up getting a lot more value in the trade down--especially because late 1st, early 2nd has a lot of players the Bengals need--Sweat being a big one.

That said, I would love it if one of the top corners or OTs fell at 18.

If they don't trade down in the 1st, and Sweat isn't there at 49...
Here is another great opportunity to trade down and accumulate 3rd/4th round picks.
There are a lot of good players in these rounds with high value.
I'm looking at OTs, IOL, WR, CB, and even DL.

Anyway, anyone else like the idea of a trade down?
Anyone not like the idea?