KEY QUESTIONS FACING O's - - - who stays? who goes?

http://www.baltimoresun.com/sports/baseball/bal-ostrades0716,0,5837419.story

Exploring the O's trade options
A look at several of the Orioles' potential trade chips

Chad Bradford, RHP

Why he could be traded: Relief help always in demand; hasn't allowed a run in 17 career playoff appearances; is owed about $1.5 million more this season and $3.5 million next year.Why he won't be: Sizable contract for a reliever who turns 34 in two months; slowed by injuries this year; is allowing well over a baserunner per inning; still valuable enough where O's would want a decent piece in return. Potential suitors: Brewers, Cardinals, Rangers

Daniel Cabrera, RHP

Why he could be traded: Several contenders desperate for starting pitching; teams might be enticed by his potential and durability; O's eventually could tire of his inconsistency.Why he won't be: O's still feel he's improving under pitching coach Rick Kranitz; he and Jeremy Guthrie only pitchers getting deep into games; under contractual control for two more seasons; league-wide skepticism if he'll ever figure it out. Potential suitors: Cardinals, Dodgers, Phillies, Yankees

Ramon Hernandez, C

Why he could be traded: Matt Wieters waiting in the wings and O's comfortable with Guillermo Quiroz in short-term; O's probably willing to eat part of contract to facilitate deal.Why he won't be: Most contenders are set at catcher; having another down year; still due approximately $3 million this season and $8 million next year. Potential suitors: Marlins

Aubrey Huff, INF

Why he could be traded: On pace for best season since 2004; should be one of better bats available on trade market; one of O's highest-paid players; free agent after next season; didn't endear himself to front office and ownership with offseason comments.Why he won't be: Still has more than $10 million left on his contract; viewed mostly as a DH; O's probably will want a decent haul for him; has become team's top power threat. Potential suitors: Angels, Diamondbacks, Dodgers, Twins

Kevin Millar, INF

Why he could be traded: Free agent at end of season; has playoff experience; leadership skills valued by contenders;Why he won't be: O's clubhouse leader; likely would only net a low-level prospect in return; has made it clear he'd prefer playing every day; far more effective as regular throughout career. Potential suitors: Mets, Rangers

Jay Payton, OF

Why he could be traded: He's made it clear he'd prefer playing every day, or being on a contender; free agent at end of season; has playoff experience.Why he won't be: Still due more than $2 million; O's might have to eat money to deal him; shopped him hard in the past and O's haven't found market. Potential suitors: Cubs, Mets

Brian Roberts, INF

Why he could be traded: Team's most valuable trade chip; could net package of young prospects in return; free agent after next season and no signs that he'd sign extension here.Why he won't be: One of O's best and most popular players; Andy MacPhail's asking price will be extreme; O's don't have in-house replacement; favorite of owner Peter Angelos. Potential suitors: Brewers, Cardinals, Dodgers, Indians, Mets, Twins, White Sox

George Sherrill, LHP

Why he could be traded: Several contenders have holes in bullpen; can either close or be situational lefty; immune to pressure, making him good fit for playoff team.Why he won't be: Affordable; not eligible for free agency until after 2011; MacPhail has stressed importance of strong bullpen; has become fan and clubhouse favorite; uncertainty with Jim Johnson's future role and Chris Ray's health. Potential suitors: Angels, Brewers, Cardinals, Dodgers, Rays,