I don't think so,Its a good time to buy!am i right?

BBQCoin, SonicScrewdriver, Sexcoin, CarpeDiemCoin +100 other totally inventionfree coins got bigger marketcaps right now..
So at least the price can't go much lower

Cryptonite is only a few weeks old, of course the market cap will still be lower than many coins.
I can mine only with nvidia GPU ? Miner?
Yes.