i had the engalls-ameda elite hospital grade pump. i love, Love, LOVED it! It's an electric but they do have an adapter available to use in a car, i believe you can probably even get a generic adapter from radio shack. I've also heard very good things about the ameda purely yours which is the smaller more portable version of the elite. the purely yours is a double pump as well as the elite. I took my elite with me to work in a backpack to pump and it worked out just fine, it takes up more room than the purely yours but it wasn't that big of an issue to me. I tried using an older medela pump in style and it was worthless compared to my ameda, maybe the new ones are better, i'm not sure.
For hand pumps/manual pumps i loved the medela harmony it worked awesome and was as close to a one hand pump as i could find as long as you could rest the collection bottle against something for support otherwise you have to hold it. The ameda hand pump i felt was obnoxious and hard to work. I had cramps in my hand after using it for just a few moments, not very egronomical i guess you would say. I also tried an even-flo hand pump and it worked okay the first couple times but after that it was just a PITA and didn't work like it did the first couple times. I only paid $15 for it so it wasn't that big of a deal, it got the job accomplished after a period of time and i've kept it purely as a back up method. The only reason i bought the even-flo one was after a couple of very lucky but naughty dogs got the bag that i was storing my medela in after i had left it on the kitchen table in a rush to get to the grocery store one night. They are quite lucky my hubby was there to run interference or i might have wrung their necks
here is the link for my pump the elite:
Ameda - Products: Hospital Grade Breast Pumps
here is a link for the purely yours:
Ameda - Products: Personal Electric Breast Pumps
here is the link for their hand pump:
Ameda - Products: Manual Breast Pumps
also Babies R Us is now carrying the ameda collection bottles and parts, they may even carry the purely yours pump, i just remember being excited to find parts in store i didn't check out the pump selection. I bought my Elite off ebay, there are always tons on there for similar prices as the manufacturers website. I paid i believe $300 for my Elite compared to the $700-$900 retail. It was used but with it being a hospital grade pump i just made sure it was cleaned really well before i used it.