Best Way to Keep Buying Momentum with Limited Cash Reserves

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Im looking at my first investment property in Philadelphia and I have about $30k to play with. Im trying to decide if its better to buy one large MFH, putting down the entire $30k, or to purchase several properties. By using lower down payments Ill be subject to higher interest rates, PMI, and thus lower cash flows in addition to more work (more properties). However, my total ROI may be significantly higher.

Ultimately, I fear I will lose momentum if I spend my entire savings on my first property. I intend to create a REI portfolio as quickly as realistically possible. What is the best plan to proceed?