If you have a small budget (like I do) you might find this interesting - it's a 3 month's young open source project that can run on Raspberry Pi's.
It's very energy efficient, has fast transaction speed and low fees.

Check www.bitcointoken.pw

If you want to check it out here's the IMG file to run on the Pi's with some simple setup instructions: https://github.com/bitcointokenbtct/BTCT-Rasp-Pi-Image

Just got listed on Coinmarketcap and has over 2000 active nodes already.
I ordered my first Raspberry Pi and hope to start it in about a week to join the project.

With your budget you could start up a nice set of Pi's and generate quite a daily income.

Greetings,
Xie