Another duplex or move to tri or quad?

[Mitchell Van Overloop]

My wife and I bought a slightly rundown duplex almost 2 years ago as owner occupants and have now fixed up both sides as they became available. We have effectively raised the rent of the side that we don't live in by over $225/month and plan to raise the side we live in by $250/month since it has direct garage access. After we end up moving out, we will be netting almost $700/month. We are getting ready to position ourselves to buy another property and are wondering if we should wait a little longer to try to buy a larger multi-unit property or try to buy multiple duplexes in the next year?