There are differences between a Studio 40 (I'm assuming you mean v3) and Monitor 11s. I've listened to & bought both Monitors & Studios (but not 40s or 11s) and depending on the mood of the day either did just fine. Reviews and prices & placebo etc. will tell you that 40s have to be better, but unless you really A/B them side by side you might not know or care. All anyone here can do is provide psychological assurance that ya done good - your ears (and budget) are the only thing that can really make your decision.
What the heck - sell the Monitor B2s and buy some Axiom 60s or 80s (that should start some other chatter ;).
What the heck - sell the Monitor B2s and buy some Axiom 60s or 80s (that should start some other chatter ;).