I bought myself a pilot case a couple of years ago for carrying books for studying and later it was very usefull when visiting clients to do an audit.
Last year I started my PPL training and used it for all my flying stuff. Now the locks are broken and I transfered everything (headset, logbook, kneeboard etc.) to a 15 year old rucksack which I once bought for about £5.
So I would say, buy whatever tickles your fancy and what is most usefull to you.
GAF4139