A.M.
Unfortunately, the act of extracting milk from yor breast is difficult to "multi task". I'd stay away from the double pumps as those will ceratinly tie you down. At least with the single pump, you have one hand free. I did not like any of the mini electric pumps. The suction was very weak and it took FOREVER to get just 2 ounces out. The Medela Pump in Style was too big,bulky,expensive and it broke on me. babies R Us would not take it back so i had to contact Medela and wait for them to "troubleshoot" me for weeks before they sent me another. I ended up selling it on Ebay.
My personal favorite was the First Years Single Electric Pump. It had the perfect amount of suction and it worked fast.
http://cgi.ebay.com/FIRST-YEARS-SINGLE-ELECTRIC-BATTERY-B...
I'd recommend it again and again. They also have Double Pump that allows single hand operation - the only premium double pump to offer single handed double pumping.