Before buying any coin right now I would wait for some crossings of either Stoch RSI or MACD going bullish on several timeframes such as 30 minute, 1 hour and more importantly 6 hour crossings. Don't just buy in this bloodbath. Normally I'd say buy it up when it's red, however the situation is a little different today.
The change in volume from yesterday to today on Bitcoin is the following:
It was over 500 million USD in trading volume yesterday and today the trading volume is over 700 million USD.
The overall market cap of cryptocurrencies has gone below the 88 billion USD which was previous support overall in the market. This tells me that we could fall a lot further on all markets, so if you already want to start buying into coins again then buy in little batches.
Check out smaller exchanges like Cryptopia, Bittrex and Yobit and look at all the coins there, you might be able to find a coin that is starting a little uptrend that you can get into, however the majority of coins will most likely keep dumping for a while.