Wow... the bottom line question has to be your call but..........
I have listened pretty extensively to the Monitor 7's the Monitor 11's the Studio 20's the Studio 60's and the Studio 100's. I have done a/b comparisons with the monitor 11's and the studio 100's at my local dealer, I will try to give you my thoughts as best I can. Mind you this was not a calibrated scientific comparison, levels were not set with an SPL meter, it was simply having them hooked up side by side and using an a/b switch. I think for most this type of testing will yield acceptable results.
**In my opinion** the studio line is tighter in the bass and stronger in the midrange, it has better imaging than the monitor line. The thing that stands out for me the most between the two is the overall sound presentation from the studio line is more enveloping, the speakers don’t draw attention to themselves the way that the monitors do. I notice much more detail with the studio line, some subtle sounds I just don’t hear in the monitors.
Your question about the difference in price is something you will need to evaluate for yourself. I appreciate your dilemma, I am in a similar one. I currently have the Axiom M60’s as my fronts the Paradigm Mini Monitors for surrounds and the Paradigm CC-370 as my center. I have been contemplating for a month whether I should go to the Studio line. Again the question arises, is it worth the effort and capital spent? I have a darn good setup as it sits but there is always the pursuit for that little bit more.
I originally thought the monitor 11’s would complete my setup and I would be done, this did not prove to be the case. I did side by side testing in my home with the Monitor 11’s head to head against my Axiom M60’s and the Axiom M60’s **in my opinion** sounded better. **To me** the M60’s are pretty comparable to the Studio 60’s in sound.
Please realize I am not trying to confuse you more with another brand of speaker I am simply stating my experiences.
I have all but made up my mind that I will make the switch over the next month to the Studio’s. **For me** the difference between the Mini Monitors to the Studio 20 is large, the difference between the CC-370 to the CC-470 is somewhat substantial, and the difference between the Axiom M60’s to the Studio 100’s is slight but still present, for me it boils down to the transparency and imaging that I hear with the Studio 100’s.
I hope I have helped and not confused the situation further, also please note the asterisks denote my opinions, naturally everyone will have their own opinions when it comes to something as critical as ones ears and the way they perceive sounds. The bottom line will be your ears and your wallet, best of luck with your decision.