My top 5 for stable but still developing coins.
1.LTC - of course, I mean, you got to invest in it.
2. ETH - same stuff
3. OMG - cool dev team, really fast development
4. XMR - I see bright future for this coin, not sure if i will rise in 10, 100, 1000x's
5. LSK - I'm in it from nearly the beggining, cool coin, awesome devs - and huge community.