Which is the best and most reliable exchange to trade BTC for XRP (Ripple)?
I have had success Bitstamp and Justcoin for BTC to XRP.
I have used TheRockTrading, Snapswap and Bitstamp for USD to XRP.
(I've just been testing all the gateways I can for the fun of it ;-)
And...with the Ripple/BTC bridge, you can exchange the two of them inside of the Ripple system
Cheers!