Quick RB thoughts:
Too High
Shaun Alexander - He'll be 30 years old on opening day next season. At best, he has 2 more elite seasons in the tank. These older guys sink like a stone in value once they hit the wall (see: Dillon, James, Faulk, Holmes). In another year, you might not get a top 15 RB for him.
Ronnie Brown - Overhyped since the moment Tagliabue called his name. Career bests of 5 TDs and 1,008 rushing yards don't inspire much confidence. He'll do a little better if he plays 16 games, but he's no stud and his team stinks. Not a chance I'd take him over Maroney or Bush in a dynasty. In fact, there's not a chance I'd take him in a dynasty.
DeAngelo Williams - Tough to justify him over Drew, Addai, Caddy, Henry, and others until he actually proves he can be the bell cow. Potential is there, but I don't like him quite so high.
Edgerrin James - Maybe he bounces back, but it's tough to justify ranking him ahead of guys like Cadillac Williams, Cedric Benson, Joseph Addai, and LenDale White. If those guys pan out, you might be looking at 3-6 solid seasons, whereas James is near the end of his rope.
Willis McGahee - He's always had plenty of talent, but Baltimore hasn't yielded an elite FF RB in a few years. I'd probably rather roll the dice on someone like Drew or Addai. To me, McGahee is comparable to Carnell Williams. Both are solid prospects who have underperformed in the FF world.
Too Low
Travis Henry - If you're going to rank Alexander #5, then you almost have to rank Henry in the top 10 (unless you expect RBBC). He has a very good chance to string together 1-2 strong years.
Thomas Jones - Very underrated player right now. I think he's due for a solid year in New York. Could be a surprise top 10 guy next season. I'd draft him before Ronnie Brown, Willis McGahee, DeAngelo Williams, Edgerrin James, Marion Barber, and possibly a few other guys you have listed before him.
Chris Perry - Looking like a great dynasty buy low right now (below Sammy Morris, Greg Jones, Correll Buckhalter, and Anthony Thomas, etc. =

) :. Has plenty of talent. Gotta think he's gonna get his chance sooner or later. Betts, M. Smith, Fargas, Morency, and others eventually did (at least for a few games). Could be a consensus top 20 type in the future. Little downside this low. I value him at about RB30.
Nice
Chester Taylor - Glad you're not buying the hype. He's overrated by most, but #22 seems like a fair spot.
LenDale White - 25 is a fair spot given the risk.
Brandon Jacobs - 32 seems fair. I don't like him and have been appalled by some of the lofty rankings others have given him.