i need help choosing rc helis

ok i have found some pretty good 4 ch rc helis but i dont know wich one to choose. i am stuck between the Walkera HM 4#3B Micro Helicopter (2.4Gz Edition) and the Walkera HM 4#3 Micro Helicopter (2.4Gz Edition). u can look at them at this site:

http://www.rchelicoptershop.com/catalog/walkera-helicopter-c-21.html

if there is another samll 4ch or up rc heli out there that is better let me know. i am lookin at these because they have a pich control. and i was wondering if they could fly upside down like the 6 ch can. so let me know! thks

If you want to buy an advanced RC helicopter, I will be happy to recommend a site for you.Rcroll has all kinds of rc helicopter, rc airplane in stock to meet various needs of RC hobby fans.
http://www.rcroll.com
Good luck,I sincerely hope you can find what you like.