above 1 year old and still devs are developing the coin
ps please dont include DRK,LTC,BTC or any coins that are already expensive or with high market cap
Why not just stick with bitcoin? It's the only one that really fits your initial criteria (bolded). Bitcoin isn't really expensive (and LTC is very cheap at the moment) but if you're just hoping to buy an alt coin cheap in the hope that it rises considerably in value I'd suggest just buying bitcoin as I still think you'll see a decent profit in the long run if you just hold.
guybrushthreepwood is right, OP.Bitcoin is the original and the one that most people love.