I used to own a 28 gallon bowfront also. I had an MP20 on it and I loved it. I did not run it full power, this was before the MP10. I think it or the MP20 will be a very good choice for you. I now have 4 MP40s that I run on my 120 reef.
For me the Tunzes flow is too direct. They are also a great choice in powerheads but I think you will prefer the EcoTech solution. Not to mention their sponsor thread is very active and you are likely to get quick responses to any inquires there.
Sadly, I have had two run-ins with their customer service. Both times the problem was taken care of immediately. (On one occasion I even got a brand new pump.) I say "sadly" because for such an expensive powerhead I should not have had any problems so soon. From my understanding though, I am the exception.
There are also a lot of people who complain about the noise. I can hear my MP40s, but never did my MP20 bother me. I would imagine that the MP10 is even less probable of making noise.
Good luck in your selection and do let us know you final decision( and maybe post a picture if possible).