I've narrowed down my first investment opportunity to the following three, but I'm a bit unclear as to which would be the best, and how I would afford them.

Obviously, this is on a commercial deal, and so it becomes much more affordable developing if you build more units and spread the development costs over more units. 

I have acquaintances who are looking for a commercial space for their business, about 3,000sq/ft and are able to afford $2,000 month rent (close to what they're paying now but are being relocated by the landlord at lease end.)

Well, I know complete radiant systems are very expensive, but I had found this system that seemed like it might be affordable.

On the granite I would say do it if you can for durability if it is affordable.

I could afford to flip homes in baltimore or richmond but they're both in excess of 2hrs away...Does anyone have any recommendations for how to get my foot in the door?

Paying a handyman $30/hr for 20hrs($600) hurts, compared to doing it myself for free, but If I had to pay myself $1,000, the numbers (my business bank account) would show that the correct choice is to hire it out.The easy answer is that if you can afford to pay somebody else to do it then you should.

Why own a huge TV if you have to spend most of your waking hours working to afford the TV?

Supply is dropping, demand is increasing, affordability is dropping, banks aren't lending, but sales prices are increasing.

The local affordable housing office will usually have inexpensive landlord training.