if you want buy riple use bitcoin the best place poloniex and bittrex
but this now poloniex is many problem, is good youre buy in bittrex and trading in there
riple is good coin with big volume transaction
I just wonder why would you trade Ripple here when you can easily get it on exchanges. Here there are more chances that people may scam by not sending you XRP, when they receive btc. Escrow can be used but it will be additional cost.