I would love to get another device, or update my existing ones. but Apple is way too expensive. I would pick up an Android device since they are cheaper, but all my toons are on iOS.
It isn't pretty but playing on an iPhone 4s (not iPhone 4 they are too slow) is doable, even on raids. It does crash, but not as bad as an ipad2 which has the most problems with CH. iOS 7 or 8 helps. I've bought them used for 30-50 USD you just need to be a bit savvy to avoid getting scammed (interesting how mmo can teach you about the real world). They are the most cost effective iOS device for CH.
You could buy an iPod 6th gen also, that is the best new device for the money, but it costs as much as 4-7 iPhone 4s.
CH has a process/memory issue impacting and crashing all devices including my iPad Air 2 and iPhone 6s+. To temporarily fix it get rid of your cache/processes every few hours/day by doing the following:
Tap the home button and close CH
Double tap the home button and swipe off CH from the background (hold down and tap X on ios6)
Hold down lock button (top or side) and swipe off your device
Start your device up and load ch
You will chat faster, load faster, play smoother, crash less for up to around a day. It helps even flagship models, low performance models often see a night and day performance change.