I went through the same thought process! I thought about selling and capitalizing on the appreciation I've gained since when I bought my sfr in 2013 however my interest rate is so cheap and rents are so crazy around here right now, that I can cash flow about $600/mo if I decide to turn it into a rental. Since my long term goal is to have enough cash flow to pay bills and the lifestyle I choose, I decided that maybe selling wouldn't be in my best interest. So I got a HELOC through US Bank and they gave me 90%ltv which was a lot more than I expected. I am under contract on my first rehab project at the moment and plan to use the Heloc money in addition to a HML to finance it. I know helocs can be dangerous if not used carefully so as long as you have a good exit strategy you should be alright. I went through veristone mortgage for the HML and they will pre-approve you just like a conventional loan for the most part. All that being said, this is just the way I am going about this.
A lot of homes are going fast and with cash right now so if there is a good deal on the table you may not be able to get it with the conventional loan if you were up against other buyers using cash. So that is something to consider. Also, you would have to make sure that your bank would be able to refinance a home you bought with hard money in a short time frame or else you're carrying costs would be pretty high while you waited Out the minimum time frame banks want. Most are 6 months that I found.
Are you only interested in cash flowing single-family homes or in multi units as well? I just closed on a five unit apartment in eastern Oregon that cash flow is pretty impressive. It's tough in our area right now to find something that cash flows without putting a ton of money down. PM if you want to talk more. I'm also an agent in and around the Portland market if you need help finding deals. Hope this helps.