Yea I gave up on eth wallets as well. I just ended up dumping my coins onto coinbase and hope they don't get hacked or something... I looked into hot wallets, but so many people have theirs keys stolen somehow. Figured it was last risk to leave it on an exchange.
I have a Dell laptop that I bought for ~$500 in 2014, upgraded to 16GB RAM and SSD, it holds ETH, LTC and BTC blockchain. It's constant network transfer is 4MB/s, avg. CPU usage 70%. Run Arch. What problem are you having?
Mist crashed only once for me when I run out of memory, "swarm" consumed 15GB of RAM and was killed by kernel. Otherwise it never crashed for me. Mist is on all the time, bitcoin once day for a few hours (3-5hrs), litecoin is on for weekends.