I know some people already invested more than 5K $ on raiblocks. Personally I'd go with BTC for a very, very long term investment. With small amount on ETH and ETC.
Can you tell me about RaiBlocks?
You can learn more of about it from here:
https://bitcointalk.org/index.php?topic=1381323.0Why RaiBlocks?
No fees: The RaiBlocks network has no notion of fees.
Low latency: Transactions are natively processed instantly giving a responsive experience.
Scalability: Micropayments require a system capable of significant scalability
Simplicity: Users have a simple experience without technical jargon.
Also the "mining" is done by people and not by CPU/GPU/ASICs.
There's a trading thread too:
https://bitcointalk.org/index.php?topic=1422828.0.
3 weeks ago the price was around 50 satoshi. Now it's around 400 satoshi.