Fluttercoin is out there as well.  It's pretty much bottomed out right now, so there is low risk in investing, a couple of BTC should be fine.  An active and knowledgable dev team, and introduces Proof of Transaction (PoT).

There's a chance with every transaction to be rewarded with free PoT.  Think of it as PoS but with spending.  It still also has PoW and PoS to strengthen the blockchain and secure the network.

If you're looking to invest you should diversify anyway and a couple of BTC in FLT wouldn't hurt.

You can check them out at fluttercoin.us