Let's talk Johnson

From MLBTR:

The Marlins are "very willing" to trade Josh Johnson for the right package, according to John Perrotto (via Twitter).  Just a few weeks ago, it seemed as though the Marlins intended on signing the 25-year-old ace to a multi-year deal.

So let's talk about that.  Now that they're publicly saying they want to get rid of him, I think this is clearly something that seems much more up Theo's alley than someone like Halladay, given that he doesn't like aging players for long periods of time, Johnson wouldn't involve trading within the AL East (or even AL), and the fact that Theo and the Marlins have some sort of rapport going on.

Now Johnson is clearly developing into an ace pitcher, a very powerful lefty.  He's only 25, with two years left, and reportedly wants a Greinke-like extension.  I think Johnson is probably easily worth that kind of extension (and Greinke is worth about 3x it!), even though it is significantly more than we're paying our other overpowering 25-year old Lefty.

He has undergone Tommy John surgery already, which may be a little worrying, but he seems to have recovered- in fact recovered extraordinarily quickly and seems no the worse for wear for it.

I do like that having him would prepare us for a possible Lester Johnson Buchholz Dice-K Wake1-2-3-4 for 2011 IFF we could get him without spending Buchholz- which would be a very powerful, very inexpensive rotation.

The problem is what will he cost to get?  The Marlins haven't made any announcements I've seen yet, but Keith Law thinks they could get 2 MLB-ready players and 2 AA-prospects.  I'm trying to think of what we could put together that would work out.  I'm not really too up on what the Marlins need, but I know they'll need some serious talent.  

I would probably want to keep Buchholz- he's another solid 25-year old with a lot of upside, unless it was basically a 1-for-1.  That would be very unlike Florida anyways, as he's probably due for an extension in a year or two and they aren't in the habit of keeping around players when they get more expensive.  

For a talent like Johnson, I'd be willing to give up Kelly as a centerpiece (I don't think I'm as up on Kelly as everyone else, partly because I don't believe his heart is in pitching and partly because he's still in A-ball and has a lot of question marks).  For MLB ready, we don't have a lot.  I'd be willing to give up Reddick, who's probably our closest- though I'm not sure if they are really in need of an OF right now.  Pitching-wise, I'd be willing to give them Bowden, who still needs some AAA time, but isn't too far from being able to do decently in AAAA.  Probably halfway through the season they could bring him to the rotation and he'd do fine.  Other than that maybe Dustin Richardson?  He's a little old and I like him a lot (I'd like to see him have a shot in spring training), but I feel like pitching would be the main thing they'd be looking for as my cursory glance of their young players looks like they have decent hitting.

What do you guys  think?  I feel like that's maybe a little weak but not sure what else I'd be willing to give and it is only 2 years of the guy. 

EDIT: Obviously the guy doesn't throw righty and I'm a moron.  Still a great pitcher, and at Fenway a killer righty is probably more useful than a killer lefty, so thoughts/admonishments are still welcome.