Bobson, you may want to look at all of the testing results from ATK's LE site -
http://le.atk.com/wound_ballistics/l...omparison.aspx. Look at the results and decide which load best meets your needs / wants.
psyopspec, the 124gr +P won't necessarily give you either better penetration or better expansion, depending on test protocol. In the IWBA Heavy Clothing test the standard pressure 124 out penetrates the +P by half an inch, and is within 5 thousandths of an inch of having equal expansion. In the FBI Heavy Clothing test the +P load opens up a four hundredths inch expansion advantage, but still trails the standard velocity load in penetration by about half an inch. Against bare gelatin the +P load does get both better penetration and expansion.
ETA: After looking over the testing the standard pressure 115 grain has the least penetration after passing through wall board. At the same time it still meets FBI and IWBA penetration minimums after passing through safety glass or heavy clothing, and it still has good expansion. Based on those results I'd go with the 115 grain if it was readily available, and functioned reliably in my pistol. I'd also not lose a wink of sleep if I had to substitute one of the other loads because of availability issues.