I'm new on this forum, as well, but I have been doing these projects for a few years. This forum looks like it might be good for some feedback.
I'm currently signed up with 15 MSC's and may try a few more. I have fired a few, as well, along the way.
I agree with you on Intelli-Shop & Marketforce. I am lukewarm on The Source (I think I'm just really tired of the grocery shops and they keep begging me to do some).
The others you mention, I may try.
You may want to try Customer Impact & Service Sense. Both are heavy on fast casual restaurant shops. My only hesitation with Service Sense is they are not set up for either direct deposit or PayPal. If you are dealing with multiple vendors, keeping track of checks in the mail is a bit much.