LOL, fantasy football roster

So I play in this silly league with a few friends every year, this year it's a 4-man league.

Autodrafted, or at least I did. We run 2 QB, 3 WR, 2 RB 1 W/R 1 TE 4 bench 2 K, 2 DEF, 2 D 1 DL 1 DB.

I have:

QB (start 2) Aaron Rodgers, Michael Vick, Matt Ryan
WR (start 3/4) Larry Fitzgerald, Reggie Wayne, Greg Jennings, Jeremy Maclin
RB (start 2/3) Arian Foster, Lesean McCoy, Darren McFadden, Ahmad Bradshaw, Jahvid Best
TE (start 1) Dallas Clark
K (start both) Gostkowski, Rackers
DEF (start both) Baltimore, San Diego
My defenseive guys all will start: Ray Lewis, Patrick Willis, LaRon Landry, Ndomnakong Suh.

Crazy roster eh?

I'm thinking I should swap out an RB for a WR for more flexibility, it's obviously a high scoring league, everyone has a pretty stacked team, but I feel good.

Which receiver would you take, and which RB would you drop. Available FA WRs are: Brandon Marshall, Stevie Johnson, Mario Manningham, Wes Welker, Boldin, Colston, Santonio Holmes, Austin Collie, Percy Harvin, Kenny Britt...and a buttload more.

I might just wait until after week 1 and see if someone seems to be "on fire" this year and try to snake em.

Also considering a second TE. Gates, Finley, Vernon Davis, Dallas Clark and Jason Witten are the only 5 off the board, all other TE in the league are up for grabs.

It's almost too much to handle, so many outstanding players are sitting in the FA pool. Easily another 2 quality teams could be formed from straight up FAs.

I'd pick up Stevie Johnson for Jahvid Best. Best is going to spend the year on IR, most likely.

Oddly enough, I made this very transaction just before I checked back to .NET.

Marshal is "listed" higher, but I just don't know what Miami is going to look like this year. Buffalo will continue to suck, but have one good receiver, just like the Lions did for several seasons.