Use of bitcoin client would be easier for him if all data expensive operations are done by third party client (for example my client) and his client would be able to verify found transactions and and them to his wallet.
that's what SPV clients, like electrum and multibit, does. they don't need you to download 70GB~ of data.
Electrum would be the ideal wallet to use, if you don't want to use up bandwidth.
There are a lot of web based wallets too, which can be tried to get acquainted with bitcoin.