@Johanna Anderson
I'm going to have to echo lots of the same advice given here. Please take the below as well-meaning thoughts offered with good intentions and not as any sort of criticism.
@Wayne Brooks is right. $60k profit is going to be less than inflation, especially once you figure in transfer costs at the front and back end to buy it and sell it back to you or someone else. You've also locked up any potential appreciation for such a low cost.
Usually there's an upfront fee for the option. I haven't done any but would imagine it would be much more than a couple thousand to option a $600k house for 5 years.
As to $2,300 rent, You can get a fair bit more rent than that for a much cheaper in price house near Silver Spring. Take a look at what some rentals are in that area and you'll see that you can almost get 2 houses not too far from Silver Spring and collect almost that much rent each house. So the investor would also be taking under market rents in Silver Spring on a rent to purchase price ratio. Some people might do that if they were sure that the house had great potential for appreciation, but not at the same time giving you a cheap option to capture all that appreciation.
I agree with @Steve Vaughan also. You need to keep your housing costs low if you're trying to keep your funds for your flipping business (my assumption, I could be wrong). It's been awhile since I've looked in Silver Spring, but $600k feels well toward the pricey end of houses in that area--which while it isn't the most expensive part of MD near DC, it's far from the cheapest or most reasonable area to live price wise. Even the $500k alternate house feels above average in price.
Is there something keeping you in Silver Spring or would moving further north like Wheaton, Glenmount, etc be an option? How about a different county where you get more house for your money in a still nice area? I remember when I was looking at houses a few years back I spent months looking at dozens of houses in an area I thought was what I wanted and ended up buying the one of the first houses I saw in an entirely different area that ended up being great for me.
If you want to start your flipping business anyway and are set on buying a place to live, have you considered a live in flip? Doesn't have to be a disaster, but buy something where you can use your skills to get it really nice for you to live in but also build equity?
But I don't know if your finances will allow both a house purchase and running your rehab business. If they don't consider what's most important to you and decide what sacrifices you are willing to make. You can find reasonably nice places to live for less than $2,300 and save the difference for your business.
I live well below my means and don't really feel like I'm missing out on all that much. I spend a lot on a few things that are really enjoyable to me like very nice vacations as I want to see the world but otherwise live off much less than what I earn.
Anyway, good luck in your endeavors. Hope it goes well for you.