I'm debating if I should run a full node or if I should code a "pretend" full node. Either way, you can assume that I can store the entire blockchain. I just don't want to store all the unspent outputs, but only the ones for my addresses. Because indexing unspent outputs for all addresses can get tedious and require up to 320GB of disk space.

I will likely need to write a balance check function from scratch. I was planning on using "PostgresFullPrunedBlockStore" from BitcoinJ and call calculateBalanceForAddress(Address) but they don't seem to have implemented this class well.