One of the most recommended/used wallets is Electrum. Can you import your private key here?
Out of curiosity and as a sanity check: do you really have 20 different wallets with 0.0007BTC each?
Update: I've just tested it on site: I can create a wallet, export private keys, and indeed it gives me a Brain Wallet and a Private Key. You don't need the Brain Wallet, just import the private key into Electrum and you're done.