Need some lipo size help here

The limn look nice, nice mah to!

im looking on the site, found these so far

http://www.hobbycity.com/hobbycity/s...idProduct=6305

http://www.hobbycity.com/hobbycity/s...idProduct=5263

http://www.hobbycity.com/hobbycity/s...idProduct=6472

The 3rd link, I could buy 2 of them, and run them in 2P

http://www.hobbycity.com/hobbycity/s...idProduct=6519

http://www.hobbycity.com/hobbycity/s...idProduct=6426

Thanks guys! And ignore all the links, there more for me to remember, but if you want to help me decide, feel free =)