Dropping established hitters to add "hot" hitters

[st3v3k4hn]

General question: Is it a mistake to drop established guys for "hot" guys? I'm not talking about dropping Cano or Pujols
I'm talking about dropping guys like Coco Crisp, Nick Markakis, and Brennan Boesch, and replacing them with hot guys like Austin Jackson, Nolan Reimold, and Cody Ross.

Specifics: I originally had Ellsbury, Choo, Markakis, and Boesch in my OF. There were no really high quality OFs left when Ellsbury got hurt, so I pretty much had to replace him with a hot hand (Jackson). I replaced Boesch with Reimold when he got hot. I'm tempted to do the same with Markakis. The problem is that now Jackson looks like he has cooled off and Reimold can't seem to stay in the lineup. The highest ranked guys available as of now are Peter Bourjos, Alex Rios and Boesch. The hottest guy available is Luke Scott. If I decide Jackson is done or Reimold can't play, do I go with the "best" available or the "hottest"? In other words, is it dumb to keep trying to "stream" in hot hitters? (Actually, at the moment Alex Rios would probably get the nod since he is finally heating up and he is one of the higher ranked guys.) Thanks for the feedback!

[ayebatter]

Seems like the 'hot hand' is always hot the day before I pick him up, and cold the day I get him, but I'd be a player for Rios.