As far as where LaRoche ranks as a hitter with those guys:
Career OPS+ through age 32 season
Todd Helton 145
Carlos Delgado 142
Kevin Millar 121
Carlos Lee 117
Paul Konerko 116
Adam LaRoche 114
Other ways to view it: LaRoche ranks 16/19 in career OPS+ among 1B accumulating 4000 or more plate appearances through their age-32 seasons from 1995 to current. In general, it's fair to say these guys do NOT age well (in order going down, Pujols, Bagwell, Helton, Fielder, Delgado, Vaughn, Gonzalez, Howard, Teixeira, Olerud, Pena, Morneau, Lee, Sexson, Konerko, LaRoche, Clark, Casey, Travis Lee).
I guess you can cling to Konerko, otherwise you have to head pretty far up that list to warrant LaRoche having significant value at age 35.