Need help on these apps

[Volinus]

These apps are in my to-buy list but i dont really know how worth they are
I want to know pros cons from users that owned these apps

-ZIP
Unarchiver (zip/unzip/unrar) Pro
Unarchiver (+file manager)
Which one has more file and zip type support?
Any differences and limitation?
I want to pack/zip file into other format than zip and rar too if they can
like 7zip

-Downloader/browser
iCab
Atomic browser
Downloader elite
iDownloader Pro
Downloads for iPad
Goodreader
I want stable/vast file format support/able to download really big file/download via java script/good interapp support
/built in or supported cloud backup like dropbox sugarsync/background download
I dont want to buy all of them , it seems redundant

About browser i need solid offline viewing(not just cache that need to open app all the time like Pocket)
and web archive/pages saving

Any youtube downloader suggestion plz

-Office
Smart office2
Quick office
iWorks
Which one is the best?
I need copy and paste table between files in spreadsheet(office2hd and document to go cant do it)
Making histogram if possible

Any suggestion other than my list is ok i need more information and facts