iOS 8.1.2 on 6+ , perfect battery life, no crashes
Not using Activator, Springtomize3 or Protean (for the moment), rather I focused on tweaks which doesn't conflict with what I use daily and more importantly battery life is not drained
accountLabels - helps label different mailboxes
BatteryUsageEnhancer - better version of detailed battery
betterFiveIconDock
BetterWifi7 (iOS7 & iOS8) [Paid] - CleverPin alternative, and great tweak for disabling passcode lock on home wifi network
BioLockDown [Paid] - Great apps for locking up certain parts of your phone
Bytafont 2 (with your choice of font, currently using San Francisco official Apple iWatch font)
CheeseCake
ClassicDock
Date in Statusbar
Eclipse 8 [Paid]
Fascy
FBNoNeedMessenger
FlipControlCenter
FolderEnhancer [Paid]
iCleaner Pro
Icon0matic
iFile
InstaEnhancer
IntelliScreenX8 [Paid]
LockGlyph
Messages Customiser
MultiIconMover
Nitrous [Paid]
NoSlowAnimations
PreferenceOrganizer2
RecentFacebook
Safe Alarm
ShowCase
StatusVol 2
SwipeSelection
Tage [Paid] - my favorite tweak, cant live without it!
Untrusted Hosts Blocker
Winterboard
Zeppelin