what is the difference between these vacuums?

GE upright vacum, Eureka Boss Whirlwind Lite Bagless Vacuum 450A, Eureka The Boss PowerPlus Vacuum

http://www.gehousewares.com/Browse_Product.aspx?
category_id=22

http://www.walmart.com/search/search-ng.do?search_query=eureka&search_constraint=0&ic=48_0&ref=+500000.500001+500500.4294296118+125874.183560+125874.243025

help me pick the best vscuum! Thanks