Which FA signing mistake would you want to see the Celtics trade for?

[jbpats]

I get the vibe that a lot of teams regret some of their off season FA signings this year, so for fun I'd like to see which fans would be most eager to trade for.

I've narrowed it down to:
Tobias Harris
Brooke Lopez
Kevin Love
Timofey Mozgov
Greg Monroe

Granted its opinionated that any of these are actually "mistakes" but based on record and performance I think all can be considered somewhat aggressive by the teams who did the signing.
Also keep in mind what we would have to trade for, a guy like Lopez or Love (and maybe Monroe) would probably cost us a Brooklyn pick. A guy like Mosgov would probably cost us a few second rounders, Harris - Amir/Sully and a mid round pick etc.
If anybody should be added to the poll let me know.

My vote would be for Tobias Harris

[boscel33]

harris.  fits a true sf need, is signed to a reasonable deal.

[knuckleballer]

Love would be my first choice, but I don't know if he will be available and the cost might be prohibitive.  My next choice is Monroe which is probably doable.

I really wonder if Love regrets not signing with the Celtics considering how we're playing and that he's missing out on the all star game for the second straight year after being a top ten player.  He'd be the man in Boston.  He's still an awkward fit in Cleveland.

[Evantime34]

A Love and Thomas pick and roll would be unstoppable. Our offense would absolutely take off with Love.

The defense might take a hit but I think the uptick in offense would make the move worth it.