its entirely more than that rippednick, what would force you to believe that the outdated RDA system used for a 145lb man would be the same for a 255lb man? Cause it is entirely different. Also, in most cases, you do get what you pay for, notice i did say most cases. Most of the extremely cheap multivitamins lack ney nutrients, are low in most and most importantly, are much harder to absorb than a higher-end multi.
Multivitamins that i would recommend would be the GNC Mega Men, Natures Plus Source of Life, Natured Way Alive, NOW Multi, etc. I do not recommend most things found at wal-mart, although some are perfectly fine.