Other server wallets than bitcoind recommended for a ubuntu server
The easiest solution would be to upgrade to the recently released version 0.12.0 which allows running a wallet while in pruning mode (which was not possible with 0.11.2). That way you can limit the required diskspace, still have a fully validating node, and don't need to do update your integration.

After the upgrade to 0.12.0 you just start bitcoind with -prune=&lt;n&gt; where &lt;n&gt; gives the amount of MiB of blockchain data you want to store. Be sure to leave some more diskspace for other data, the other files in the bitcoin directory don't count toward the limit.