Which pump do you prefer?

Hope
Currently my daughter will be 10 months on the 6th, and we have been exclusively breastfeeding, except when she is at daycare and I am at work. My pump is the pump In Style Advansed (PISA), and I am almost certain it is losing its suction power. 
I use it at work to pump at 11am and 3pm, and then again at 9pm after she has nursed, and then again at 12am and anytime between 3&4am. Then we nurse at 7am, 6pm and again at 9pm to top her off for bed. She then sleeps all night from 9pm to anywhere before 6&7am. 
I am an overproducer or at least I was, and until just within the last month maybe 2 tops, my pump has quit suctioning. I use to be able to pump anywhere from 8-10oz sometimes 12 total in no less than 10-15 minutes. Last night I decided to power pump because any and every time I pump, my boobs do no feel like they are empty. When I started I only pumped 2 1/2oz on each side. When it was all said and done, I had pumped 8 1/2 oz total. 
I have been in touch with Medela, and have tried doing some troubleshooting, and changing the breastshields, and while it helped for a few days, it hasn't changed or helped lately, infact its worse. 
I am going to be in contact with Medela again after the holiday, but am also considering other pumps.  If they are not wanting to replace, then I for sure will be looking into other options. 
What pump do you use? What have you tried? What do you recommend? Pictures would helpful. Thank in advance!

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