Fantasy Football: Buy low on Tony Romo, sell high on Matt Ryan

After six weeks, some teams in your league may be cruising, while others are desperate to make a move in an attempt to save their season. However, there is still a long way to go. A well-timed move now can still help you gear up for a title run.

With that in mind, let's analyze some good candidates to buy low and sell high as you negotiate with other league members in an attempt to improve your team.

BUY LOW

Tony Romo (QB, Cowboys) - With RB DeMarco Murray sidelined and Romo figuring out how to make the most of WR Dez Bryant, expect Dallas to lean more heavily on its passing game.

Stevan Ridley (RB, Patriots) - Don't overanalyze his poor effort against the stout Seattle defense. The Pats have proved they can run effectively and he'll get the bulk of the carries.

Steve Johnson (WR, Bills) - Buffalo has faced some tough matchups lately, but the schedule gets easier soon and the passing game still revolves around Stevie Styles.

Others: Matthew Stafford (QB, Lions), Darren McFadden (RB, Raiders), Chris Johnson (RB, Titans), Doug Martin (RB, Buccaneers), Steve Smith (WR, Panthers), Dez Bryant (WR, Cowboys)

SELL HIGH

Matt Ryan (QB, Falcons) - Still a clear cut starter, but he's got a tough schedule approaching and he's not the top five QB others may think he is.

Shonn Greene (RB, Jets) - Don't expect Sunday's great game to repeat itself anytime soon. Get rid of him before other owners remember that Tim Tebow may be a more dangerous running threat.

Wes Welker (WR, Patriots) - Just four weeks ago he was in Bill Belichick's doghouse and there weren't enough targets to go around. With TE Aaron Hernandez back, it is a good time to ship Welker to an owner with a short memory.

Others: Marshawn Lynch (RB, Seahawks), Michael Turner (RB, Falcons), Reggie Wayne (WR, Colts), Randall Cobb (WR, Packers), Tony Gonzalez (TE, Falcons).

Alex Case is amNY's fantasy football columnist.