@Matt Owens - I've used the HELOC route to expand my portfolio and it has been extremely effective. I HELOC'd my 1 bedroom condo in Boston MA, took out $200K and used that as a warchest to expand my portfolio. I utilized it for 3 househacks and 3 joint venture amounting to 20+ units. The key with the HELOC strategy is understanding the concept of arbitrage. Whatever you utilize this HELOC for, it is imperitive that you transition these funds into opportunities that provide a much higher return than what you are borrowing at.
Additionally, I personally like the Northeast market, much less competition since people interpret the tenant friendly aspect as more challenging, but with that comes less competition. Additionally, it is way more insulated than the sun belt due to the regulatory requirements when it comes to building. It is much more challenging to create supply in the Northeast further increasing demand. I invest in MA, RI and plan on investing in NH. All good markets if you target the right tertiary area.