Yes, I think 1M Nxt at 1 BTC is a good buy, that's roughly a $1M valuation for the whole Nxt currency, which is a good time to get it. Right now I suspect we are around $5M total valuation with current sell prices.
Current Market Cap: $21,190,158
That would rank Nxt 7th on www.coinmarketcap.com at the time of writing!
Market Cap Calculation for those who are interested:
(1,000,000,000 total coins) x (current price of 1 Nxt) = Market Cap
Last Trade: 1 Nxt = ฿0.00001980
฿1 = $1070.21