Will you post links to some of these packages? I'm building up my Emacs Python toolkit after many years of being a Vim user (with liberal use of Evil mode of course! :-)
It's an elegant and very powerful extension of the built-in completion that works particularly well on reallyStupidlyLongMethodNames in programming languages - especially handy in conjunction with tags and cscope if you're jumping around a large codebase. Dunno if it plays well with Evil mode though.